Where are you receiving the assertions? In the Unity Editor or in Google?
How are you adding terms? It looks like you are adding lots of them at the same time, are you importing them from a CSV file?
Or do you just create them in the editor and when exporting to google your get that error?
If you could list them some steps I could use to reproduce the problem, it will help me a lot to understand whats wrong and give you a solution!
Are you Give I2L 5 stars!
Are you Please lets us know how to improve it!