Dear Lydia Simplicio,
Thank you for your answer.
1. I saved the actual error stack and attach it this thread.
2. I failed to place cf tags within the target side, saving translated sentences, so the red error appeared. After that, I erased the translated sentence.
After several weeks, I tried to remove the error by placing cf tag within the target side. I also tried to do term base work , but it didn't work.
I am not sure the term base issue is related or a separate concern.
The present situation is: before the error occurred, the term base worked normally. Now the term base do not work on the sampled project and other projects which were fully translated.
Best Regards,
Jung Bong Yoon