The `f` was not included in the function name. Copy>paste mistake.

include/squirrel.h

@@ -329,7 +329,7 @@ SQUIRREL_API const SQChar *sq_getlocal(HSQUIRRELVM v,SQUnsignedInteger level,SQU
 SQUIRREL_API SQRESULT sq_getcallee(HSQUIRRELVM v);
 SQUIRREL_API const SQChar *sq_getfreevariable(HSQUIRRELVM v,SQInteger idx,SQUnsignedInteger nval);
 SQUIRREL_API SQRESULT sq_throwerror(HSQUIRRELVM v,const SQChar *err);
-SQUIRREL_API SQRESULT sq_throwerror(HSQUIRRELVM v,const SQChar *err,...);
+SQUIRREL_API SQRESULT sq_throwerrorf(HSQUIRRELVM v,const SQChar *err,...);
 SQUIRREL_API SQRESULT sq_throwobject(HSQUIRRELVM v);
 SQUIRREL_API void sq_reseterror(HSQUIRRELVM v);
 SQUIRREL_API void sq_getlasterror(HSQUIRRELVM v);