Following the below two links I am trying to call the nintex webservice to complete the nintexflexi task response from infopath form itself, after following each step correctly when I open the infopath form, it gives the below error message,though both the links are enough confident that it should work. Could somebody please help me why this error message.
http://blogs.microsoft.co.il/sash/2013/06/22/how-to-complete-a-flexi-task-using-infopath-control-button/
https://askmanisha.wordpress.com/2013/07/19/clubbing-infopath-form-nintex-approval-form/
The query cannot be run for the following DataObject: GetRunningWorkflowTasksForCurrentUserForListItem
InfoPath cannot run the specified query.
The SOAP response indicates that an error occurred:
Server was unable to read request. ---> There is an error in XML document (1, 426). ---> Input string was not in a correct format.