Bonita Community 6.3.2

Get Error Item not Found when completing a task


I have a form that goes through different approval actors. The last step in the process is to close the form. When I close the form, I get this error: "Item not Found Oups...This item is not available anymore. You will be redirected to a safest place.". When I click the Ok button displayed in this prompt, the site just hangs. What would cause such an error?