no marshal_dump is defined for class

11175 (-- --) August 21, 2009, 5:16pm 1

Hi all, Does anyone knows what this error message means?

Topic		Replies	Views
no marshal_dump is defined for class StringIO rubyonrails-talk	0	212	March 18, 2008
unknown error on line 11 rubyonrails-talk	0	175	September 13, 2017
/!\ FAILSAFE /!\ error with Rails 2.3.4 rubyonrails-talk	2	169	February 2, 2010
Is there a way to save an object to disk? rubyonrails-talk	0	138	October 23, 2006
I have this error message and don't know what to do rubyonrails-talk	0	126	January 26, 2007