Home › Forums › QuickApps Forum › qSIListView Error when adding webpart to page in designer › RE: qSIListView Error when adding webpart to page in designer
I see that you're on QWP 5.7 SP2010 and from the error message I see a reference to a much earlier version.
Please go to the GAC (c:\windows\assembly) , find the WA.SystemIntegration entry and check the version.
Also deleting and recreating the web part (save the XML configuration to a text file before deleting the wp) can solve the problem.
An iisreset can help.