system.debug('welcome to tcl akbar')
Standard input is empty
Object: nil error: did not understand #associationAt:ifAbsent: MessageNotUnderstood(Exception)>>signal (ExcHandling.st:254) UndefinedObject(Object)>>doesNotUnderstand: #associationAt:ifAbsent: (SysExcept.st:1448) DeferredVariableBinding>>resolvePathFrom: (DeferBinding.st:115) DeferredVariableBinding>>value (DeferBinding.st:69) UndefinedObject>>executeStatements (prog:1)