You will find there are limits in how much data can be effectively exported through reports. How much you can do will depend on the number of rows, number of columns, and size of data held in those columns. If you are running FlexNet Manager Suite OnPremises, you can check the webui.log file on the web application server for specific details of the error (looking up the error code that is quoted), but in most cases I expect you will find you get an out of memory type error at large scale.
The best strategy for dealing with this situation is to ensure you configure reports with appropriate filtering to restrict the number of rows (e.g. don't attempt to configure a report listing all applications installations on all devices - apply a filter to limit it to selected devices, publishers or similar), and limit the number of columns included in the report.
For exports of bulk data from a FlexNet Manager Suite OnPremises system, consider directly querying the database.
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