stride3d/stride · error · InvalidOperationException

Asset of type has been serialized with newer version , but…

Error message

Asset of type {assetType} has been serialized with newer version {serializedVersion}, but only version {expectedVersion} is supported. Was this asset created with a newer version of Stride?

What it means

MigrateAssetIfNeeded compares the asset file's serializedVersion against the currently supported (upgrader) version for its type. A serializedVersion GREATER than expected means the file was written by a newer Stride than the running one, and migration cannot go backwards, so it throws InvalidOperationException.

Solutions

Upgrade the Stride packages/runtime to a version matching or exceeding the asset's serialized version
Re-export/re-save the asset from the newer Stride version down if downgrade is supported by the asset pipeline
Regenerate the asset with the current Stride version (reimport the source)
Restore the asset file from version control to a version compatible with the installed SDK

Defensive patterns

Strategy: try-catch

Validate before calling

var meta = ReadYamlMetadata(assetPath);
var supported = AssetRegistry.GetUpgrader(assetType).CurrentVersion;
if (meta?.AssetVersion > supported)
    throw new InvalidOperationException($"Asset needs Stride version supporting version {meta.AssetVersion}");

Try / catch

try { PackageSession.Load(...); }
catch (InvalidOperationException ex) when (ex.Message.Contains("serialized with newer version"))
{ log.Error("Content was built with a newer Stride; upgrade the SDK or re-export the asset."); }

Prevention

Keep all team members on the same Stride SDK version
Pin template/project Stride versions in CI
Re-import assets from source when switching SDK versions downward

When it happens

Trigger: Opening/saving an asset whose YAML metadata records a higher AssetVersion than the loaded assembly's AssetUpgraders provide; loading game content produced by a newer Stride editor or a newer package version.

Common situations: Team members on different Stride versions sharing the same game assets; pulling assets from a template/project built with a newer release; running an older build of the game against newer content.

Related errors

AI-assisted analysis of stride3d/stride@96fad776d2 (2026-09-14). Data as JSON: /api/errors/0a84e09b98c5b85d. Report an issue: GitHub.

Appendix: source

Thrown at sources/assets/Stride.Core.Assets/AssetMigration.cs:120

                            }
                        }

                        yamlEventReader.Expect<MappingEnd>();
                    }
                    break;
                }
                else
                {
                    // If anything else than Id or SerializedVersion, let's stop
                    break;
                }
            }
        }

        if (serializedVersion > expectedVersion)
        {
            // Try to open an asset newer than what we support (probably generated by a newer Stride)
            throw new InvalidOperationException($"Asset of type {assetType} has been serialized with newer version {serializedVersion}, but only version {expectedVersion} is supported. Was this asset created with a newer version of Stride?");
        }

        if (serializedVersion < expectedVersion)
        {
            // Perform asset upgrade
            context.Log.Verbose($"{Path.GetFullPath(assetFullPath)} needs update, from version {serializedVersion} to version {expectedVersion}");

            using var yamlAsset = loadAsset.AsYamlAsset();
            var yamlRootNode = yamlAsset.RootNode;

            // Check if there is any asset updater
            var assetUpgraders = AssetRegistry.GetAssetUpgraders(assetType, dependencyName)
                ?? throw new InvalidOperationException($"Asset of type {assetType} should be updated from version {serializedVersion} to {expectedVersion}, but no asset migration path was found");

            // Instantiate asset updaters
            var currentVersion = serializedVersion;
            while (currentVersion != expectedVersion)
            {

View on GitHub (pinned to 96fad776d2)