when i insert a module with sj contact Ajax in my page i receive this error :
error 404
Serialization of 'SimpleXMLElement' is not allowed
if i disable module all work well, where is the problem?

some me here have problem
how can fix it?

This is a recurring problem. Support fixed it on my test page, and as soon as I assigned the module to another menu, it crashed the whole site again. I don't think it's a conflict with another plug-in, but Support didn't tell me what they did to fix the first problem.

P.S. It's not just the Ajax Contact, all of my Zoo extensions do the same thing. #FAIL

And it is very strange that some days site worked normally with this module. But yesterday I get the same problem.