You'd need to post this section of your process; the process is likely to be moving through a calculated condition or there is a condition in an action data instance which is failing.
a "(1,1)" error is usually caused by the calculation testing the value of an object or attribute that is null. This can be fixed by improving the calculation code logic or possibly setting the default value property of an object in Business Object Designer.
If you turn on diagnostic logging (in ConfigurationCenter) for this web app and set diagnostics for "calculations" you should be able to get more info on the calc that is failing in the logs.
Thanks Julian . . .
I'll take a closer look as recommended "-b)