When a report download is requested in techSHIP this might getting a result in an error: 

Several instances of this report cannot be run on same portal at the same time. Please try again later.

The cause of this error message is a big volume of data being requested in a previous report and still have not finished to retrieve the information. 

Warning!  Please take into account that Techship has a restrictions on running the same report in parallel.

                 One user can download the report in the same time only.

In this case necessary to request to download the same report again.