I am trying to post an ajax request, but no matter what i do, the response is coming back as the following error:

new Object();r.error = new ajax_error('System.FormatException','Input string was not in a correct format.\r\nCould not retreive parameters from HTTP request.',0)new Object();r.error = new ajax_error('System.ArgumentException','Object of type \'System.DBNull\' cannot be converted to type \'System.Int32\'.',0)

I recorded the request with the HTTP Proxy server and have not changed any of the formatting/syntax of the request (other than updating values that must be unique). So im confused as to why i keep getting this error. Another interesting point is that jmeter does not view this response as an error.

Has anyone else run into this problem?