Getting the error message: The document cannot be created or opened. The error code is: File EXISTS BUT IS INVALID. when opening web intelligence reports.

Document ID : KB000029471
Last Modified Date : 14/02/2018
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Description:

Using Business Objects Enterprise XI 3.1 Service Pack 5.
Getting the error message: The document cannot be created or opened. The error code is: File EXISTS BUT IS INVALID. when opening web intelligence reports.
  

Solution:

The output cache is timing out due to a network connection which has been queued. If any network traffic is there, then the pending requests gets delayed and accordingly the session gets timed out and throw the error.

Resolution 1:

Disable caching for the Web Intelligence Processing Server

Resolution 2:

Make sure that the network share is close to the Processing Server and that the network can handle heavy traffic without latency.