> ## Documentation Index > Fetch the complete documentation index at: https://docs.loft.build/llms.txt > Use this file to discover all available pages before exploring further. # The D-code registry Every stable error code, generated from the one registry the compiler enforces. Codes + line numbers are the conformance-normative half of an expected-error file; the kebab-case names are mnemonics for humans and grep — not part of the contract. Message prose and suggestions are non-normative and may be reworded freely. **GENERATED FILE — do not edit.** The source of truth is `/packages/lang/src/schema/errors.ts`. Edit the registry and run `pnpm gen:errors`; CI pins this file to the generator's output. Spec and docs prose cite codes from this file and never invent them — when adding a condition, take the block's stated next free code. Rules of the registry (from the source): a code names one semantic condition; several throw sites may share a code, one site never emits two; codes are NEVER renumbered or reused — a retired condition keeps its code, marked retired below. ## D01xx — lexical (tokenize) | Code | Name | Status | | ----- | ------------------------------- | ------ | | D0101 | `unterminated-string` | active | | D0102 | `bad-length-literal` | active | | D0103 | `unexpected-character` | active | | D0104 | `hyphenated-name-before-length` | active | **Next free code in this block: D0105.** New conditions take the next number; gaps below it are deliberate growth room, never free. ## D02xx — statement syntax | Code | Name | Status | | ----- | ---------------------------------------- | --------------------------------------------------------------------------------------------------------- | | D0201 | `unexpected-end-of-line` | active | | D0202 | `expected-word` | active | | D0203 | `expected-name` | active | | D0204 | `length-needs-units` | active | | D0205 | `expected-length` | active | | D0206 | `expected-string` | active | | D0207 | `expected-punctuation` | active | | D0208 | `unexpected-trailing-tokens` | active | | D0209 | `missing-statement-keyword` | active | | D0210 | `reserved-statement` | active | | D0211 | `unknown-statement` | active | | D0212 | `id-shadows-reserved-word` | active | | D0213 | `unexpected-token-in-statement` | active | | D0220 | `metric-not-in-v0` | active | | D0221 | `unknown-unit-system` | active | | D0222 | `bad-grid-axis` | active | | D0223 | `walltype-width-expression` | active | | D0224 | `walltype-needs-width-or-layers` | active | | D0225 | `core-layers-not-contiguous` | active | | D0226 | `retired-justify-spelling` | active | | D0227 | `unknown-justification` | active | | D0228 | `wall-top-and-height` | active | | D0229 | `opening-from-renamed` | active | | D0230 | `not-a-direction-keyword` | active | | D0231 | `bad-swing-direction` | active | | D0232 | `door-flip-ambiguous` | active | | D0233 | `opening-needs-width` | active | | D0234 | `coordinate-pair-or-line-datum-expected` | active | | D0235 | `carrier-clause-needs-first-person-side` | active | | D0236 | `carrier-extent-not-a-datum` | active | | D0237 | `wall-type-leads-the-statement` | active | | D0238 | `wall-end-expression-needs-a-datum` | active | | D0239 | `door-leads-with-its-type` | active | | D0240 | `type-parameter-needs-literal` | active | | D0241 | `type-omits-required-parameter` | active | | D0242 | `kind-reserved` | active | | D0243 | `unknown-type-parameter` | active | | D0244 | `delegation-needs-value-type` | active | | D0245 | `unquoted-text-value` | active | | D0246 | `instance-outside-type-declaration` | active | | D0247 | `required-marker-misplaced` | active | | D0248 | `block-colon-without-block` | active | | D0249 | `unexpected-indent` | active | | D0250 | `inconsistent-block-indent` | active | | D0251 | `statement-has-no-block-form` | active | | D0252 | `block-line-holds-one-parameter` | active | | D0253 | `on-renamed-along` | active | | D0254 | `room-label-renamed-name` | active | | D0255 | `declaration-missing-id` | active | | D0256 | `view-kind-reserved` | active | | D0257 | `unknown-view-kind` | active | | D0258 | `view-body-reserved` | active | | D0259 | `level-height-and-top` | retired v0.4 decision 83 — `height` beside `above` is legal (the override) | | D0260 | `level-needs-height-or-top` | retired v0.4 decision 83 — a level with neither is legal syntax; the missing story is D0526 at resolution | | D0261 | `view-range-word-anchored` | active | | D0262 | `one-view-per-file` | active | | D0263 | `view-file-content` | active | | D0264 | `kind-reserved-as-id` | active | | D0265 | `section-takes-no-level` | active | | D0266 | `plan-needs-of` | active | | D0267 | `section-axis-unknown` | active | | D0268 | `section-axis-mixed` | active | | D0269 | `section-trim-not-anchored` | active | | D0270 | `plan-range-takes-length` | active | | D0272 | `window-needs-sill` | active | | D0273 | `level-top-retired` | active | | D0274 | `parameter-reserved` | active | | D0275 | `opening-needs-height` | active | **Next free code in this block: D0276.** New conditions take the next number; gaps below it are deliberate growth room, never free. ## D03xx — reference spelling & lookup | Code | Name | Status | | ----- | ---------------------------------------- | ------------------------------------------------------------------------------------------------------------------ | | D0301 | `wrong-reference-kind` | active | | D0302 | `reserved-reference` | active | | D0303 | `unknown-qualified-datum` | retired 2026-09-17 — an unknown `grid.X` / `level.X` in an expression is D0305, like every unknown reference | | D0304 | `element-anchors-reserved` | retired v0.2 session 1 — accessors shipped (D0310+) | | D0305 | `unknown-reference` | active | | D0306 | `bare-reference` | active | | D0307 | `too-many-ambiguous-names` | retired 2026-09-17 — a bare name never resolves, so it is never ambiguous; a bare spelling is D0306 | | D0310 | `accessor-unknown-element` | retired 2026-09-17 — an accessor on an unknown element is D0305, the one unknown-reference error | | D0311 | `accessor-unknown-datum` | active | | D0312 | `accessor-wrong-category` | active | | D0313 | `line-datum-in-expression` | active | | D0314 | `opening-datum-outside-host-measurement` | active | | D0315 | `datum-name-reserved-or-pending` | active | | D0316 | `second-person-travel-qualifier` | active | | D0317 | `qualifier-not-applicable` | active | | D0318 | `wall-not-axis-aligned` | active | | D0319 | `plane-datum-in-coordinate-slot` | active | | D0320 | `top-anchor-bad-datum` | active | | D0321 | `opening-vertical-datum-unconsumable` | active | | D0322 | `wall-datum-in-opening-measurement` | active | | D0323 | `bad-carrier-ref` | active | | D0324 | `unknown-extent-ref` | retired 2026-09-17 — an unknown extent is D0305; the extent's shape errors keep their codes | | D0325 | `room-anchored-to-element` | active | | D0326 | `retired-datum-spelling` | active | | D0327 | `wall-face-needs-side` | active | | D0328 | `roomline-not-referenceable` | retired 2026-09-17 — a roomline reference is D0301: a known category nothing may reference, with the leaf sentence | | D0329 | `view-extent-anchored-to-element` | active | | D0330 | `level-elev-anchored-to-element` | active | **Next free code in this block: D0331.** New conditions take the next number; gaps below it are deliberate growth room, never free. ## D04xx — expressions & dimensional typing | Code | Name | Status | | ----- | ---------------------------- | ------ | | D0401 | `expected-closing-paren` | active | | D0402 | `expected-expression-factor` | active | | D0403 | `missing-operator` | active | | D0404 | `no-negative-literal` | active | | D0410 | `bare-number-term` | active | | D0411 | `length-minus-position` | active | | D0412 | `position-plus-position` | active | | D0413 | `axis-mismatch-subtraction` | active | | D0414 | `position-scaling` | active | | D0415 | `area-not-in-v0` | active | | D0416 | `bad-divisor` | active | | D0417 | `division-by-zero` | active | | D0420 | `wrong-direction-grid` | active | | D0421 | `level-in-plan-slot` | active | | D0422 | `wrong-axis-position` | active | | D0423 | `unanchored-length` | active | | D0424 | `bare-number-in-slot` | active | | D0425 | `position-for-length-slot` | active | | D0426 | `unresolvable-expression` | active | **Next free code in this block: D0427.** New conditions take the next number; gaps below it are deliberate growth room, never free. ## D05xx — declarations & resolution | Code | Name | Status | | ----- | --------------------------------- | ------------------------------------------------------------------------------------------------------------------------------ | | D0501 | `duplicate-id` | active | | D0502 | `datum-cycle` | active | | D0503 | `failed-reference-cascade` | active | | D0504 | `opening-cycle` | active | | D0505 | `multiple-levels` | retired v0.4 session 3e — multi-story shipped (decision 74); a second level is legal, and an element's ambiguous base is D0520 | | D0506 | `ambiguous-opening-reference` | retired 2026-09-17 — a reference names its category, so a bare id can never name two things; a bare spelling is D0306 | | D0507 | `unknown-walltype` | retired 2026-09-17 — an unknown walltype is D0305, like every unknown reference | | D0508 | `no-level-declared` | active | | D0509 | `unknown-level-reference` | retired 2026-09-17 — an unknown level in `base`, `top` or `above` is D0305, like every unknown reference | | D0510 | `unknown-host-wall` | retired 2026-09-17 — an unknown host wall is D0305, like every unknown reference | | D0511 | `unknown-opening-reference` | retired 2026-09-17 — an unknown measurement reference is D0305, like every unknown reference | | D0512 | `element-anchor-cycle` | active | | D0513 | `unknown-door-or-window-type` | retired 2026-09-17 — an unknown doortype or windowtype is D0305, like every unknown reference | | D0514 | `parameter-fixed-by-type` | active | | D0515 | `delegated-parameter-missing` | active | | D0516 | `user-parameter-type-conflict` | active | | D0517 | `required-parameter-not-positive` | active | | D0518 | `parameter-not-declared-by-type` | active | | D0519 | `unknown-viewtype` | retired 2026-09-17 — an unknown viewtype is D0305, like every unknown reference | | D0520 | `element-level-ambiguous` | active | | D0521 | `file-level-statement-repeated` | active | | D0522 | `view-range-inverted` | active | | D0523 | `above-needs-standing-level` | active | | D0524 | `level-above-ambiguous` | active | | D0525 | `no-level-above` | active | | D0526 | `level-needs-height` | active | **Next free code in this block: D0527.** New conditions take the next number; gaps below it are deliberate growth room, never free. ## D06xx — geometry & placement | Code | Name | Status | | ----- | ----------------------------------- | ---------------------------------------------------------------------------------------- | | D0601 | `zero-length-wall` | active | | D0602 | `core-justify-unsupported` | retired v0.4 session 2a — side × plane justify shipped (`justify left foc`, decision 66) | | D0603 | `wall-top-below-base` | active | | D0604 | `grid-parallel-to-wall` | active | | D0605 | `wall-parallel-to-wall` | active | | D0606 | `reference-in-other-wall` | active | | D0607 | `opening-overflows-wall` | active | | D0608 | `extent-never-crosses-carrier` | active | | D0609 | `wall-not-clear-of-carrier` | active | | D0610 | `openings-overlap` | active | | D0611 | `on-carrier-not-a-declared-datum` | active | | D0612 | `view-extent-inside-out` | active | | D0613 | `level-above-below-elev` | active | | D0614 | `section-depth-zero` | active | | D0615 | `section-trim-inverted` | active | | D0616 | `opening-overflows-wall-vertically` | active | **Next free code in this block: D0617.** New conditions take the next number; gaps below it are deliberate growth room, never free. ## D07xx — graphic standard | Code | Name | Status | | ----- | ----------------------------- | ------ | | D0701 | `token-reference-unknown` | active | | D0702 | `token-reference-cycle` | active | | D0703 | `token-type-mismatch` | active | | D0704 | `token-value-invalid` | active | | D0705 | `scale-without-values` | active | | D0706 | `scale-context-unknown` | active | | D0707 | `role-unknown` | active | | D0708 | `category-unknown` | active | | D0709 | `hatch-not-seamless` | active | | D0710 | `object-style-missing` | active | | D0711 | `scale-follows-chain` | active | | D0712 | `material-word-claimed-twice` | active | | D0713 | `construct-unsupported` | active | | D0714 | `dialect-unknown` | active | | D0715 | `source-unreadable` | active | | D0716 | `token-defined-twice` | active | **Next free code in this block: D0717.** New conditions take the next number; gaps below it are deliberate growth room, never free.