Topic: To recover solution

I have that that lies on ftp (deployment). There is a project which altered, like only view would change. But if to enclose , but an error which I can not intercept a debugger. First Chance Exception caught System. NullReferenceException: ' Object reference not set to an instance of an object. ' System. Web. HttpException: ' Error executing child request for/content/err500.aspx. ' but in the code did not find where it is a question as from publish to recover solution?