{"record":{"id":"28421f2816b9fdde","repo":"Aider-AI/aider","slug":"file-referenced-in-patch-not-found-rel-path","errorCode":null,"errorMessage":"File referenced in patch not found: {rel_path}","messagePattern":"File referenced in patch not found: (.+?)","errorType":"exception","errorClass":"DiffError","httpStatus":null,"severity":"error","filePath":"aider/coders/patch_coder.py","lineNumber":270,"sourceCode":"            start_index = 0\n        else:\n            start_index = 1  # Skip \"*** Begin Patch\"\n\n        # Identify files needed for context lookups during parsing\n        needed_paths = identify_files_needed(content)\n        current_files: Dict[str, str] = {}\n        for rel_path in needed_paths:\n            abs_path = self.abs_root_path(rel_path)\n            try:\n                # Use io.read_text to handle potential errors/encodings\n                file_content = self.io.read_text(abs_path)\n                if file_content is None:\n                    raise DiffError(\n                        f\"File referenced in patch not found or could not be read: {rel_path}\"\n                    )\n                current_files[rel_path] = file_content\n            except FileNotFoundError:\n                raise DiffError(f\"File referenced in patch not found: {rel_path}\")\n            except IOError as e:\n                raise DiffError(f\"Error reading file {rel_path}: {e}\")\n\n        try:\n            # Parse the patch text using adapted logic\n            patch_obj = self._parse_patch_text(lines, start_index, current_files)\n            # Convert Patch object actions dict to a list of tuples (path, action)\n            # for compatibility with the base Coder's prepare_to_edit method.\n            results = []\n            for path, action in patch_obj.actions.items():\n                results.append((path, action))\n            return results\n        except DiffError as e:\n            # Raise as ValueError for consistency with other coders' error handling\n            raise ValueError(f\"Error parsing patch content: {e}\")\n        except Exception as e:\n            # Catch unexpected errors during parsing\n            raise ValueError(f\"Unexpected error parsing patch: {e}\")","sourceCodeStart":252,"sourceCodeEnd":288,"githubUrl":"https://github.com/Aider-AI/aider/blob/5dc9490bb35f9729ef2c95d00a19ccd30c26339c/aider/coders/patch_coder.py#L252-L288","documentation":"The FileNotFoundError branch of the same preload loop in PatchCoder.get_edits: abs_root_path resolved the path, but io.read_text raised FileNotFoundError, so the patch targets a file that is definitively absent from disk.","triggerScenarios":"io.read_text raises FileNotFoundError (rather than returning None) for an '*** Update File:'/'*** Delete File:' path — e.g. a path in a directory that doesn't exist, or a file deleted between chat history generation and patch application.","commonSituations":"Continuing a session after the file was deleted/moved externally; patches referencing paths from another repo layout; hallucinated filenames whose parent directories don't exist.","solutions":["Confirm the file exists: ls <path-from-patch> from the repo root.","Restore/recreate the file (git checkout -- path) if it was deleted mid-session, then re-apply.","Use '*** Add File:' for files that should be created rather than updated.","Re-sync the model's view of the repo (/drop the stale file, /add the current one) and regenerate the patch."],"exampleFix":"# before\n*** Update File: deleted_module.py   (file was removed)\n\n# after\n*** Add File: deleted_module.py\ndef restored():\n    ...","handlingStrategy":"validation","validationCode":"from pathlib import Path\n\ndef missing_update_paths(patch_text: str, root: Path) -> list[str]:\n    out = []\n    for l in patch_text.splitlines():\n        s = l.strip()\n        if s.startswith((\"*** Update File: \", \"*** Delete File: \")):\n            rel = s.split(\": \", 1)[1].strip()\n            if not (root / rel).is_file():\n                out.append(rel)\n    return out","typeGuard":null,"tryCatchPattern":"try:\n    coder.get_edits(patch_text)\nexcept ValueError as e:\n    if \"File referenced in patch not found:\" in str(e):\n        rel = str(e).split(\"File referenced in patch not found:\")[-1].strip()\n        patch_text = relabel_or_add_file(patch_text, rel)  # fix path or use Add\n        coder.get_edits(patch_text)\n    else:\n        raise","preventionTips":["Re-sync the chat's file list with the working tree after deletes/moves.","Prefer regenerating patches against the current commit rather than reusing old ones.","Use git status to confirm referenced paths exist before applying model patches."],"tags":["aider","patch-format","filesystem","file-not-found"],"backgroundTag":null,"analyzedSha":"5dc9490bb35f9729ef2c95d00a19ccd30c26339c","analyzedAt":"2026-08-15T05:40:10.498Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}