This can happen when:
1. The NP designer is closed via the Windows task manager, then the NP Designer is started again without closing MS Excel process (MS Word, MS Power point) which is running in the background. The process should also be closed before attempting to open the NP designer again
2. The NPrinting connection to the NPrinting report is in error/aborted status. NPrinting connections must be in a 'Generated' State. To ensure there is no issue with the connection that appears to be in "Generated" state, simply reload any NP connections associated with your NPrinting reports that fail to open with the aforementioned error.
Note: To ensure you have a supported version of MS Office for your deployment, ensure to check the Help Notes for your specific version of NPrinting.
If these do not resolve the issue, I would recommend starting a support ticket so that the issue may be investigated more thoroughly.
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