stride3d/stride · error · InvalidOperationException

Unable to decode objectid

Error message

Unable to decode objectid [{0}] when reading asset index

What it means

Data validation in ContentIndexMap.ReadEntries: the second token of an index-map line (the object id GUID) could not be parsed, meaning the file contains a malformed or truncated entry. The url parsed fine, but the asset id is not a valid GUID.

Solutions

1. Fix or remove the malformed line in the index map file so the object id is a valid GUID
2. Regenerate the index map by recompiling the assets
3. Restore from a backup if the file was hand-edited and partially corrupted

When it happens

Trigger: Thrown at sources/core/Stride.Core.Serialization/Serialization/Contents/ContentIndexMap.cs:130 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

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

AI-assisted analysis of stride3d/stride@96fad776d2 (2026-09-14). Data as JSON: /api/errors/b55b5cffa00eb5a9. Report an issue: GitHub.

Appendix: source

Thrown at sources/core/Stride.Core.Serialization/Serialization/Contents/ContentIndexMap.cs:130

            var match = regexEntry.Match(line);
            if (!match.Success)
            {
                throw new InvalidOperationException("Unable to read asset index entry [{0}]. Expecting: [path objectId]".ToFormat(line));
            }

            var url = match.Groups[1].Value;
            var objectIdStr = match.Groups[2].Value;

            // Test if the name has leading or ending spaces
            var matchSpace = regexEntrySpace.Match(line);
            if (matchSpace.Success && !matchSpace.Groups[1].Value.Equals(url))
            {
                throw new InvalidOperationException("Assets names cannot have empty spaces before or after the name. Please rename [{0}] and compile again.".ToFormat(matchSpace.Groups[1].Value));
            }

            if (!ObjectId.TryParse(objectIdStr, out var objectId))
            {
                throw new InvalidOperationException("Unable to decode objectid [{0}] when reading asset index".ToFormat(objectIdStr));
            }

            var entry = new KeyValuePair<string, ObjectId>(url, objectId);
            entries.Add(entry);
        }
        return entries;
    }

    protected override void WriteEntry(Stream localStream, KeyValuePair<string, ObjectId> value)
    {
        ArgumentNullException.ThrowIfNull(localStream);

        var line = $"{value.Key} {value.Value}\n";
        var bytes = Encoding.UTF8.GetBytes(line);
        localStream.Write(bytes, 0, bytes.Length);
    }

    [GeneratedRegex(@"^(.*?)\s+(\w+)$")]

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