{"record":{"id":"d02070d58b8e7a7a","repo":"stride3d/stride","slug":"property-path-parse-error-could-not-find-indexer-end","errorCode":null,"errorMessage":"Property path parse error: could not find indexer end ']'","messagePattern":"Property path parse error: could not find indexer end '\\]'","errorType":"validation","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"sources/engine/Stride.Engine/Updater/UpdateEngine.cs","lineNumber":189,"sourceCode":"\n                // Parse the new path parts\n                state.ParseElementStart = state.StackPath.Last().EndIndex;\n\n                // Compute offset from start of current object\n                state.NewOffset = state.StackPath.Last().ObjectStartOffset;\n\n                while (state.ParseElementStart < animationPath.Name.Length)\n                {\n                    var containerType = state.StackPath.Last().Type;\n\n                    // We have only two cases for now: array or property/field name\n                    bool isIndexerAccess = animationPath.Name[state.ParseElementStart] == PathIndexerOpen;\n                    if (isIndexerAccess)\n                    {\n                        // Parse until end of indexer\n                        state.ParseElementEnd = animationPath.Name.IndexOf(PathIndexerClose, state.ParseElementStart + 1);\n                        if (state.ParseElementEnd == -1)\n                            throw new InvalidOperationException(\"Property path parse error: could not find indexer end ']'\");\n\n                        // Include the indexer close\n                        state.ParseElementEnd++;\n\n                        // Parse integer\n                        // TODO: Avoid substring?\n                        var indexerString = animationPath.Name.Substring(state.ParseElementStart + 1, state.ParseElementEnd - state.ParseElementStart - 2);\n\n                        // T[], IList<T>, etc...\n                        // Try to resolve using custom resolver\n                        UpdatableMember updatableMember = null;\n                        var parentType = containerType;\n                        while (parentType != null)\n                        {\n                            UpdateMemberResolver resolver;\n                            if (MemberResolvers.TryGetValue(parentType, out resolver))\n                            {\n                                updatableMember = resolver.ResolveIndexer(indexerString);","sourceCodeStart":171,"sourceCodeEnd":207,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/engine/Stride.Engine/Updater/UpdateEngine.cs#L171-L207","documentation":"UpdateEngine.Compile tokenizes a property path (used by animations, scripts, and the property updater) and, when it detects an indexer segment ('['), searches for the matching ']'. If the closing bracket is missing, it throws InvalidOperationException because the path is syntactically incomplete.","triggerScenarios":"Calling Compile with a path containing '[' but no ']', e.g. 'Transform.Position[' or 'Items[0'. The IndexOf(PathIndexerClose) returns -1 and the error is thrown.","commonSituations":"Truncated property paths from string concatenation; paths copied incompletely from editors/logs; animation key targets generated from UI text that lost the closing bracket.","solutions":["Complete the path so every '[' has a matching ']': 'Items[0]' not 'Items[0'.","Validate the path with a parser/regex before calling Compile.","Escape or strip stray '[' characters that are not intended as indexers.","Log the full animation path and member names when compilation fails to spot truncation."],"exampleFix":"// before\nvar path = \"Materials[0\"; // missing ']'\n// after\nvar path = \"Materials[0]\";","handlingStrategy":"validation","validationCode":"bool hasBalancedIndexers(string path) => path.Count(c => c == '[') == path.Count(c => c == ']');","typeGuard":null,"tryCatchPattern":"try { engine.Compile(target, path, ...); } catch (InvalidOperationException ex) when (ex.Message.Contains(\"indexer end\")) { log.Error($\"Unclosed '[' in path: {path}\"); }","preventionTips":["Check bracket balance before Compile","Avoid string truncation when concatenating paths","Strip stray '[' characters not meant as indexers","Log full paths on compile failure"],"tags":["property-path","parsing","animation"],"backgroundTag":"invalid-argument-format","analyzedSha":"96fad776d210c221682aac1ccdf4c79dc046fc38","analyzedAt":"2026-09-14T02:59:31.279Z","contentChangedAt":"2026-09-14T02:59:31.279Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}