stride3d/stride · error · InvalidOperationException

Property path parse error: could not find binding info for…

Error message

Property path parse error: could not find binding info for index {0} in type {1}

What it means

During UpdateEngine.Compile, after parsing an indexer value, the engine looks up the corresponding binding/accessor metadata on the container type. If no updatable member (binding info) is found for that index, it throws InvalidOperationException — meaning the numeric index cannot be resolved against the actual runtime type (e.g. index out of range or the member isn't indexable).

Solutions

1. Verify the property path matches the actual type graph: correct member name, correct element type, and a valid index within bounds.
2. Ensure the target type is public and its array/list member is accessible to the updater (Blittable/Serializable as required).
3. Rebuild or fix the path after any schema/refactor change; re-export animations targeting renamed/retyped members.
4. Catch InvalidOperationException from Compile and report the container type + index to diagnose which member is unbindable.

Example fix

// before
var path = "Keyframes[10]"; // Keyframes is a Dictionary, not an array
// after
var path = "KeyframeList[10]"; // bind to the array/list member

bool canBind(object target, string member, int index) { var p = target.GetType().GetProperty(member); return p != null && (p.PropertyType.IsArray || (p.PropertyType.IsGenericType && p.PropertyType.GetGenericTypeDefinition() == typeof(List<>))); }

try { engine.Compile(target, path, out attrs, out blittables, out updatables); } catch (InvalidOperationException ex) when (ex.Message.Contains("binding info")) { log.Error($"Path {path} does not match type {target.GetType()}: {ex.Message}"); }

When it happens

Trigger: Compiling a path like 'Items[5]' where the container type has no accessible indexer binding for 5 — the member is not an array/list, the type lacks the expected accessor metadata, or the compiled path element mismatches the real object graph (static type vs runtime type mismatch).

Common situations: Animation targeting a member that changed type between versions (array -> dictionary or plain field); paths built against one entity type but applied to another; indices beyond collection bounds surfaced as missing binding info; using paths on structs/types without registered updatable members.

Understand the failure class

Background: "Must be a positive integer", "Invalid value", "Unsupported": the invalid-argument-value error family, when a library rejects the value you pass — this error's family across 35 libraries.

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

Related errors

• Property path parse error: could not find binding info for…
• Could not resolve type
• Property path parse error: could not find cast operation…
• Property path parse error: could not find indexer end ']'
• Property path parse error: could not parse indexer value

AI-assisted analysis of stride3d/stride@96fad776d2 (2026-09-14). Data as JSON: /api/errors/f7c17fc01a0effe4. Report an issue: GitHub.

Appendix: source

Thrown at sources/engine/Stride.Engine/Updater/UpdateEngine.cs:232

                        // Try interfaces
                        if (updatableMember == null)
                        {
                            foreach (var implementedInterface in containerType.GetTypeInfo().ImplementedInterfaces)
                            {
                                UpdateMemberResolver resolver;
                                if (MemberResolvers.TryGetValue(implementedInterface, out resolver))
                                {
                                    updatableMember = resolver.ResolveIndexer(indexerString);
                                    if (updatableMember != null)
                                        break;
                                }
                            }
                        }

                        if (updatableMember == null)
                        {
                            throw new InvalidOperationException(string.Format("Property path parse error: could not find binding info for index {0} in type {1}", indexerString, containerType));
                        }

                        ProcessMember(ref state, animationPath, updatableMember, temporaryObjectsList);
                    }
                    else
                    {
                        // Note: first character might be a . delimiter, if so, skip it
                        var propertyStart = state.ParseElementStart;
                        if (animationPath.Name[propertyStart] == PathDelimiter)
                            propertyStart++;

                        // Check if it started with a parenthesis (to perform a cast operation)
                        if (animationPath.Name[propertyStart] == PathCastOpen)
                        {
                            // Parse until end of cast operation
                            state.ParseElementEnd = animationPath.Name.IndexOf(PathCastClose, ++propertyStart);
                            if (state.ParseElementEnd == -1)
                                throw new InvalidOperationException("Property path parse error: could not find cast operation ending ')'");

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