It looks like the version of Infragistics 5.3 that you are using (5.3.20053.50) does not exactly match the supported version of Infragistics 5.3 that we are expecting (5.3.20053.73).
To handle these minor mismatches, you must run the Assembly Binding Redirector tool (accessible from the IdeaBlade DevForce shortcut). If you run this tool, it will ask you whether you want to redirect from the supported version of 5.3.20053.73 to the installed version of 5.3.20053.50. Select "Yes".