ACO error protocols
Instance methods
gpInfo 
Answer the gpinfo string and nil if there was no general protection fault. 
identifier 
Answer a string describing the error identifier. 
isAcoError 
Answer true. 
errorCode 
Answer the error number. 
message 
Answer a string describing the error reported by the receiver. 
printOn: aStream 
Print a text representation of the receiver on aStream. The format is <identifier>(<errno>: <message>. 
Last modified date: 01/29/2015