{"record":{"id":"da85db887d497f4f","repo":"Aider-AI/aider","slug":"update-file-error-missing-file-content-for-pat","errorCode":null,"errorMessage":"Update File Error - missing file content for: {path}","messagePattern":"Update File Error - missing file content for: (.+?)","errorType":"exception","errorClass":"DiffError","httpStatus":null,"severity":"error","filePath":"aider/coders/patch_coder.py","lineNumber":325,"sourceCode":"                break  # Successfully reached end\n\n            # ---------- UPDATE ---------- #\n            if norm_line.startswith(\"*** Update File: \"):\n                path = norm_line[len(\"*** Update File: \") :].strip()\n                index += 1\n                if not path:\n                    raise DiffError(\"Update File action missing path.\")\n\n                # Optional move target\n                move_to = None\n                if index < len(lines) and _norm(lines[index]).startswith(\"*** Move to: \"):\n                    move_to = _norm(lines[index])[len(\"*** Move to: \") :].strip()\n                    index += 1\n                    if not move_to:\n                        raise DiffError(\"Move to action missing path.\")\n\n                if path not in current_files:\n                    raise DiffError(f\"Update File Error - missing file content for: {path}\")\n\n                file_content = current_files[path]\n\n                existing_action = patch.actions.get(path)\n                if existing_action is not None:\n                    # Merge additional UPDATE block into the existing one\n                    if existing_action.type != ActionType.UPDATE:\n                        raise DiffError(f\"Conflicting actions for file: {path}\")\n\n                    new_action, index, fuzz = self._parse_update_file_sections(\n                        lines, index, file_content\n                    )\n                    existing_action.chunks.extend(new_action.chunks)\n\n                    if move_to:\n                        if existing_action.move_path and existing_action.move_path != move_to:\n                            raise DiffError(f\"Conflicting move targets for file: {path}\")\n                        existing_action.move_path = move_to","sourceCodeStart":307,"sourceCodeEnd":343,"githubUrl":"https://github.com/Aider-AI/aider/blob/5dc9490bb35f9729ef2c95d00a19ccd30c26339c/aider/coders/patch_coder.py#L307-L343","documentation":"Raised by PatchCoder._parse_patch_text when an '*** Update File:' path is not in the current_files dict preloaded by get_edits. current_files only contains paths returned by identify_files_needed (those seen under '*** Update File:'/'*** Delete File:' headers during the pre-scan), so this fires when the parse-time path differs from the pre-scan path or the preload silently skipped it.","triggerScenarios":"A path that reaches the UPDATE branch in _parse_patch_text but was never loaded: typically path spelling/case differences between the identify_files_needed pre-scan and the parse loop, or a preload that failed to populate the entry for an exactly matching path (the None-return read case raises earlier, so mismatches are the usual cause).","commonSituations":"Trailing whitespace, case differences, or './' prefixes that make the parsed path differ string-wise from the scanned one; patches produced against a different filesystem where case matters; duplicated update headers with inconsistent path spellings.","solutions":["Make every occurrence of the path in the patch byte-identical (same case, same './' prefix, no trailing spaces).","Check the exact path string in the error against an ls of the repo root.","If the file genuinely exists, ensure get_edits' preload succeeded for it (no earlier read errors).","Regenerate the patch with consistent paths and feed the error back to the model."],"exampleFix":"# before\n*** Update File: ./src/App.py\n...\n*** Update File: src/app.py   (second, inconsistent spelling → missing content)\n\n# after\n*** Update File: src/app.py   (one consistent spelling everywhere)","handlingStrategy":"validation","validationCode":"def path_spelling_is_consistent(patch_text: str) -> bool:\n    import re\n    paths = [m.group(1).strip() for m in re.finditer(r\"\\*\\*\\* (?:Update|Delete) File: (.+)\", patch_text)]\n    return len(paths) == len(set(paths))  # False → mixed spellings; normalize first","typeGuard":null,"tryCatchPattern":"try:\n    coder.get_edits(patch_text)\nexcept ValueError as e:\n    if \"missing file content for:\" in str(e):\n        patch_text = normalize_paths(patch_text)  # one canonical spelling per file\n        coder.get_edits(patch_text)\n    else:\n        raise","preventionTips":["Use one canonical relative path spelling for each file throughout the whole patch (case, './', trailing spaces).","Generate paths programmatically from the repo manifest instead of letting the model retype them.","On case-sensitive filesystems, verify path case matches disk exactly."],"tags":["aider","patch-format","parsing","path","case-sensitivity"],"backgroundTag":null,"analyzedSha":"5dc9490bb35f9729ef2c95d00a19ccd30c26339c","analyzedAt":"2026-08-15T05:40:10.498Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}