Error 4049

Hi all,
can someone help me to fix this error?

dsdt.dsl 7202: WBYT (TSAD, 0x4F, Local0)
Error 4049 - ^ Method local variable is not initialized (Local0)

Best Regards
Dirk Partikel

Part of dsdt:
Method (STOS, 3, NotSerialized)

   {
       WBYT (TSAD, 0x4F, 

Local0) Ln 7202
}

   Method (STHY, 3, NotSerialized)
   {
       WBYT (TSAD, 0x4F, Arg1)
   }