Hi Chhay,
Sorry for the troubles you are having. Have you tried restarting LEAP? Sometimes this fixes the problem.
Also, I noticed that you are using the 64-bit version of LEAP which was only recently released this year. Unless you plan on developing a very large model, we recommend that you install and use the 32-bit version for now since it is slightly faster and thoroughly road-tested. You can download the 32-bit version through the LEAP downloads page:
https://www.energycommunity.org/default.asp?action=download
Should you continue to have problems after installing the 32-bit version of LEAP, please let us know.
Thanks,
Emily