After recently upgrading a client to Microsoft Dynamics GP 2013 they have been doing some testing. As well as GP itself they also use Integration Manager to integrate data from other systems.
Part of their testing plan involved testing the integrations; good thing they did as one problem, not a large one though, was found.
When trying to view the error logs the following error was produced:
Log Report Failure: Could not load file or assembly ‘Microsoft.ReportViewer.WinForms, Version=126.96.36.199, Culture=Neutral, PublicKeyToken=b03f5f7f11d50a3a’ or one of its dependencies. The system cannot find the file specified
The solution is to install the Microsoft Report Viewer Redistributable which can be found here.