stride3d/stride · error · InvalidOperationException

Content serializer for

Error message

Content serializer for {url} could not be found. Was expecting to find type {objType} but the actual type of the resource was {headerObjType}

What it means

Serializer resolution failure in ContentManager.DeserializeObject: no content serializer matched the url, and the mismatch is diagnosed as the file's stored type header differing from the requested type — the on-disk resource is not of the type the caller expects.

Solutions

1. Request the type actually stored in the file (per the header) instead of the current expected type
2. Recompile/re-export the asset with the expected type
3. Verify the url points to the intended asset and isn't shadowed by another file

When it happens

Trigger: Thrown at sources/core/Stride.Core.Serialization/Serialization/Contents/ContentManager.cs:461 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of stride3d/stride@96fad776d2 (2026-09-14). Data as JSON: /api/errors/d95b62b225b488bb. Report an issue: GitHub.

Appendix: source

Thrown at sources/core/Stride.Core.Serialization/Serialization/Contents/ContentManager.cs:461

            // File does not exist
            // TODO/Benlitz: Add a log entry for that, it's not expected to happen
            if (stream == null)
                return null;

            Type? headerObjType = null;

            // Read header
            var streamReader = new BinarySerializationReader(stream);
            var chunkHeader = ChunkHeader.Read(streamReader);
            if (chunkHeader != null)
            {
                headerObjType = AssemblyRegistry.GetType(chunkHeader.Type);
            }

            // Find serializer
            var serializer = Serializer.GetSerializer(headerObjType, objType);
            if (serializer == null)
                throw new InvalidOperationException($"Content serializer for {url} could not be found. Was expecting to find type {objType} but the actual type of the resource was {headerObjType}");
            contentSerializerContext = new ContentSerializerContext(url, ArchiveMode.Deserialize, this)
            {
                LoadContentReferences = settings.LoadContentReferences,
                AllowContentStreaming = settings.AllowContentStreaming,
            };

            // Read chunk references
            if (chunkHeader != null && chunkHeader.OffsetToReferences != -1)
            {
                // Seek to where references are stored and deserialize them
                streamReader.UnderlyingStream.Seek(chunkHeader.OffsetToReferences, SeekOrigin.Begin);
                contentSerializerContext.SerializeReferences(streamReader);
                streamReader.UnderlyingStream.Seek(chunkHeader.OffsetToObject, SeekOrigin.Begin);
            }

            if (reference == null)
            {
                // Create Reference

View on GitHub (pinned to 96fad776d2)