Unfortunately, although NoiseMap Enterprise can hold 16,000 receiver points, it is limited to only 8000 different receiver names, owing to legacy issues.
In your case, you have over 8000 receiver points, all with different names, generated automatically within NoiseMap 5.
You will need to delete the some of the receivers or export the receivers into separate archives and create separate models each with less than 8000 different receiver names.
We would hope to correct this issue in some future release of NoiseMap Enterprise.