Re: Need help debugging a Singleton TypeError in my app.

WuyaSea Operator
2006-12-02T22:04:01Z

"What are the most common causes of the: "TypeError (singleton
can''t be
dumped)" error? "
you put IO kind of  objects or singleton obj into session, when rails
try to serialize it and save it into session, ruby complains since they
can''t be marshalled/serialized.

uploaded image blob is of StringIO type, you should exclude that from
saving into session.

wuyaSea Operator