clockworklabs/SpacetimeDB · error · InvalidOperationException

Unsupported system type {name}

Error message

Unsupported system type {name}

What it means

Error "Unsupported system type {name}" thrown in clockworklabs/SpacetimeDB.

Source

Thrown at crates/bindings-csharp/BSATN.Codegen/Utils.cs:181

                        $"Enum {type} does not have a [SpacetimeDB.Type] attribute"
                    );
                }
                return $"SpacetimeDB.BSATN.Enum<{SymbolToName(type)}>";
            }
            var result = type.OriginalDefinition.ToString() switch
            {
                // {U/I}{128/256} are not treated by C# as regular primitives, so we need to match them by type name.
                "System.Int128" => "SpacetimeDB.BSATN.I128",
                "System.UInt128" => "SpacetimeDB.BSATN.U128",
                "SpacetimeDB.I128" => "SpacetimeDB.BSATN.I128Stdb",
                "SpacetimeDB.U128" => "SpacetimeDB.BSATN.U128Stdb",
                "SpacetimeDB.I256" => "SpacetimeDB.BSATN.I256",
                "SpacetimeDB.U256" => "SpacetimeDB.BSATN.U256",
                "System.Collections.Generic.List<T>" => $"SpacetimeDB.BSATN.List",
                "System.Collections.Generic.IEnumerable<T>" => $"SpacetimeDB.BSATN.List",
                // If we're here, then this is nullable *value* type like `int?`.
                "System.Nullable<T>" => $"SpacetimeDB.BSATN.ValueOption",
                var name when name.StartsWith("System.") => throw new InvalidOperationException(
                    $"Unsupported system type {name}"
                ),
                _ => $"{SymbolToName(type)}.BSATN",
            };
            if (type.IsGenericType)
            {
                result =
                    $"{result}<{string.Join(", ", type.TypeArguments.Select(SymbolToName).Concat(type.TypeArguments.Select(GetTypeInfo)))}>";
            }

            return result;
        }
    }

    // Polyfill for .NET methods from .NET Standard 2.1+:
    private static StringBuilder AppendJoin<T>(
        this StringBuilder sb,
        string separator,

View on GitHub (pinned to 524b4487d9)

When it happens

Trigger: Thrown at crates/bindings-csharp/BSATN.Codegen/Utils.cs:181 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of clockworklabs/SpacetimeDB@524b4487d9 (2026-08-16). Data as JSON: /api/errors/871ee7ba506f358e. Report an issue: GitHub.