{"record":{"id":"d914fe4eec2cfc81","repo":"Aider-AI/aider","slug":"file-referenced-in-patch-not-found-or-could-not-be","errorCode":null,"errorMessage":"File referenced in patch not found or could not be read: {rel_path}","messagePattern":"File referenced in patch not found or could not be read: (.+?)","errorType":"exception","errorClass":"DiffError","httpStatus":null,"severity":"error","filePath":"aider/coders/patch_coder.py","lineNumber":265,"sourceCode":"                return []\n            # If it looks like a patch but lacks sentinels, try parsing anyway but warn.\n            self.io.tool_warning(\n                \"Patch format warning: Missing '*** Begin Patch'/'*** End Patch' sentinels.\"\n            )\n            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:","sourceCodeStart":247,"sourceCodeEnd":283,"githubUrl":"https://github.com/Aider-AI/aider/blob/5dc9490bb35f9729ef2c95d00a19ccd30c26339c/aider/coders/patch_coder.py#L247-L283","documentation":"Raised by PatchCoder.get_edits while preloading context: for a path listed under '*** Update File:'/'*** Delete File:', self.io.read_text(abs_path) returned None (aider's IO returns None for unreadable/missing files instead of raising). The patch references a file that does not exist on disk or cannot be read.","triggerScenarios":"A patch updating/deleting a file whose path doesn't exist under the repo root, has wrong case, points outside the working tree, or has an encoding/permission problem that makes io.read_text return None.","commonSituations":"Model hallucinating a plausible-but-wrong filename; patches generated against a different commit where the file existed; path case mismatches on case-insensitive filesystems ported to Linux; paths with a wrong leading './' or absolute path; unreadable binary/encoding-mismatched files.","solutions":["Verify the path exists relative to the coder's root: ls the exact string from '*** Update File:' (watch case and leading slashes).","If the file is new, use '*** Add File:' instead of '*** Update File:'.","Check permissions/encoding if the file exists — io.read_text returns None for files aider refuses to read (e.g. non-UTF-8 without the right setting).","Re-run against the correct branch/commit where the file exists, or /add the real file so the model sees its true path."],"exampleFix":"# before\n*** Update File: src/utils/Helpers.py   (actual file: src/utils/helpers.py)\n\n# after\n*** Update File: src/utils/helpers.py","handlingStrategy":"validation","validationCode":"def verify_patch_paths_readable(patch_text: str, root: str):\n    import os\n    bad = []\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            p = os.path.join(root, rel)\n            if not os.path.isfile(p) or not os.access(p, os.R_OK):\n                bad.append(rel)\n    return bad  # non-empty → fix paths (or switch to *** Add File:) before get_edits()","typeGuard":null,"tryCatchPattern":"try:\n    coder.get_edits(patch_text)\nexcept ValueError as e:\n    if \"not found or could not be read\" in str(e):\n        rel = str(e).rsplit(\": \", 1)[-1]\n        if not (root / rel).exists():\n            patch_text = convert_update_to_add(patch_text, rel)\n        coder.get_edits(patch_text)\n    else:\n        raise","preventionTips":["Validate every Update/Delete path against the filesystem before applying.","Use '*** Add File:' for files that should be created.","Watch path case and './' prefixes — paths are matched string-wise against disk."],"tags":["aider","patch-format","filesystem","path"],"backgroundTag":null,"analyzedSha":"5dc9490bb35f9729ef2c95d00a19ccd30c26339c","analyzedAt":"2026-08-15T05:40:10.498Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}