Errors

The errors that Yarn Spinner can emit.

Yarn Spinner Error Codes

Errors

Code	Message
YS0001	Variable has conflicting implicit type declarations. A variable is being used as different types in different places.
YS0002	Type mismatch. An expression's type doesn't match what's expected (e.g. assigning a number to a boolean).
YS0004	Missing node delimiter. A node is missing its === closing delimiter.
YS0005	Syntax error. Something in the script can't be parsed.
YS0006	Unclosed command. A << was opened but never closed with >>.
YS0007	Unclosed scope. A control flow block (like <<if>>) isn't properly closed (missing <<endif>>).
YS0011	Duplicate node title. Two or more nodes have the same title without when: clauses to distinguish them.
YS0012	Jump to undefined node. A <<jump>> or <<detour>> targets a node that doesn't exist.
YS0013	Invalid function call. A function is called with the wrong number or type of parameters, or doesn't exist.
YS0014	Invalid or unknown command. A command isn't recognised. Check spelling or make sure it's defined in your definitions file.
YS0017	Line has both #line and #shadow tags. A line can't be both — shadow lines don't get their own line ID.
YS0018	Duplicate line ID. Every #line: tag in a project must be unique.
YS0021	Stray >> without a matching <<.
YS0022	Command keyword outside of << and >>. Did you forget the angle brackets?
YS0025	Unknown enum member. The value isn't a known member of the expected enum type.
YS0023	Wrong enum type. The value is from a different enum than what the parameter expects.
YS0024	Enum type expected. The parameter expects an enum value but got something else.
YS0026	Enum format error. Enum values should be written as EnumName.Value.
YS0027	Invalid node name. Node titles can only contain letters, numbers, and underscores.
YS0028	Can't infer variable type. Declare the variable explicitly with <<declare>>.
YS0029	Can't determine expression type. The compiler can't figure out what type this expression evaluates to.
YS0030	Can't modify a smart variable. Smart variables are computed values and are read-only.
YS0031	Missing when: clause in node group. If some nodes in a group have when: clauses, all must have them (use when: always as a fallback).
YS0032	Duplicate subtitle in node group. Subtitles within a node group must be unique.
YS0034	Incompatible function. A library function has a signature that can't be used in Yarn scripts.
YS0035	Enum declaration error.
YS0036	Feature requires newer project version. A language feature was used that needs a higher projectFileVersion.
YS0037	Invalid literal value. A constant value couldn't be parsed.
YS0038	Unresolved type member. A type member access (like Enum.Value) couldn't be resolved.
YS0039	Variable redeclaration. A variable can only be declared once.
YS0040	Type redeclaration. A type with this name already exists.
YS0041	Internal compiler error. Something unexpected happened. Please file an issue.
YS0042	Unknown line ID for shadow line. The #shadow: tag references a line ID that doesn't exist.
YS0043	Shadow lines can't have expressions. Shadow lines must be plain text.
YS0044	Shadow line text mismatch. A shadow line must have the same text as its source line.
YS0045	Smart variable reference loop. A smart variable's expression references itself through other smart variables.
YS0046	Null default value. Variable declarations must have a non-null default value.
YS0047	Expression took too long to resolve. Try simplifying this expression.

Warnings

Code	Message
YS0003	Undeclared variable. A variable is used without being declared. Add a <<declare>> statement.
YS0008	Unreachable code. Code that will never be executed.
YS0015	Cyclic node dependency. Nodes reference each other in a loop, which may cause infinite loops.
YS0016	Unknown character. A character name isn't defined in the project. Add it to your .yarnproject file's characters list.

Info

Code	Message
YS0010	Unused variable. A variable is declared but never used anywhere.