In order to solve and understand your errors, you need to be able to see the path they took through your code. In the error analysis screen, OverOps shows you the full call stack - from entry point to the method in which the error occurred - even across multiple machines.
On the left hand side of the error analysis screen, OverOps shows you the call stack for the error. OverOps tracks the code and variables state for the error all the way back to the entry point into your code, where you can see the parameters that were passed into it. If the error involves calls across multiple machines, OverOps will show you the unified call stack. Clicking on a method in the call stack will jump you to that method on the right hand side.
A unified call stack