{"record":{"id":"780789a73e9e136a","repo":"reflex-dev/reflex","slug":"plugin-plugin-name-is-trying-to-modify-path-bu","errorCode":null,"errorMessage":"Plugin {plugin_name} is trying to modify {path} but it does not exist.","messagePattern":"Plugin (.+?) is trying to modify (.+?) but it does not exist\\.","errorType":"exception","errorClass":"FileNotFoundError","httpStatus":null,"severity":"error","filePath":"reflex/compiler/compiler.py","lineNumber":1461,"sourceCode":"        for static_file_path, content in plugin.get_static_assets():\n            path = utils.resolve_path_of_web_dir(static_file_path)\n            if path in output_mapping:\n                logger.warning(\n                    f\"Plugin {plugin.__class__.__name__} is overwriting existing files at {path}.\"\n                )\n            output_mapping[path] = (\n                content.decode(\"utf-8\") if isinstance(content, bytes) else content\n            )\n\n    for plugin_name, file_path, modify_fn in modify_files_tasks:\n        path = utils.resolve_path_of_web_dir(file_path)\n        file_content = output_mapping.get(path)\n        if file_content is None:\n            if path.exists():\n                file_content = path.read_text()\n            else:\n                msg = f\"Plugin {plugin_name} is trying to modify {path} but it does not exist.\"\n                raise FileNotFoundError(msg)\n        output_mapping[path] = modify_fn(file_content)\n\n    with log.timing(logger, \"Write to Disk\"):\n        for output_path, code in output_mapping.items():\n            utils.write_file(output_path, code)\n\n    return True\n","sourceCodeStart":1443,"sourceCodeEnd":1469,"githubUrl":"https://github.com/reflex-dev/reflex/blob/45b8ed5ab735f8a56bbb09a42384f030eb0208e7/reflex/compiler/compiler.py#L1443-L1469","documentation":"During the plugin output-modification phase of compile_app, a plugin's modify hook targets a file path that is neither in the compiled output mapping nor present on disk, so there is no content to modify. Reflex raises FileNotFoundError naming the plugin and path.","triggerScenarios":"A plugin's get_modified_outputs / output modification hook returns a modify_fn for a path that was never emitted by compilation (typo'd path, wrong extension like .jsx vs .tsx, or a file only produced under other config) and that doesn't exist on disk.","commonSituations":"Custom or third-party Reflex plugins referencing output files with incorrect paths; Reflex upgrades changing emitted filenames while the plugin wasn't updated; plugins targeting files emitted only when certain features (e.g. radix themes) are enabled.","solutions":["Verify the exact path against compiled output in the .web directory and fix the plugin's path constant","Make the plugin's modify hook tolerant: check path.exists()/output_mapping before returning a modify_fn","Pin or update the plugin to a version compatible with your Reflex version"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"from pathlib import Path\n\ndef safe_modify_path(path: Path, output_mapping: dict) -> bool:\n    return path in output_mapping or path.exists()","typeGuard":null,"tryCatchPattern":"try:\n    compile_app(app)\nexcept FileNotFoundError as e:\n    if \"trying to modify\" in str(e):\n        # fix plugin path or skip plugin\n        ...\n    raise","preventionTips":["Verify plugin target paths against .web output after upgrades","Make plugin modify hooks no-op when the target file is absent","Pin plugin and Reflex versions together and test compiles in CI"],"tags":["reflex","plugin","compiler","filenotfound"],"backgroundTag":"plugin-file-path-missing","analyzedSha":"45b8ed5ab735f8a56bbb09a42384f030eb0208e7","analyzedAt":"2026-08-28T19:25:27.644Z","schemaVersion":2},"datasetVersion":"2026-08-28T21:17:43.275Z"}