strsplit issue - Pig

I have following tuple H1 and I want to strsplit its $0 into tuple.However I always get an error message:

DUMP H1:
(item32;item31;,1)

m = FOREACH H1 GENERATE STRSPLIT($0, ";", 50);

ERROR 1000: Error during parsing. Lexical error at line 1, column 40. Encountered: after : "\";"

Anyone knows what's wrong with the script?