To correct this issue, do the following:
1. Make sure the Lotus Notes client is installed on all Ingest Servers.
2. Open all Lotus Notes instances to clear any pop-ups that may prevent a file from being opened.
3. Update the system's "Path" environmental variable to include the path to the nnotes.dll file. After making the change, restart the Ingest Server service and re-ingest the NSF file.
Note: Please make sure you are also using the 32-bit KeyVIew/Ingest Server combo if you have the Notes Client, as the Notes Client for Windows is 32 bit only.
You can use the 64/bit KeyView Ingest Server combo with Domino Server