Dear Medali,
Thank you for using Portfolio Manager.
Regarding the issue, please check that there are no spaces in the project ID entered.
If the problem persists, please check if you have added the Behance API key correctly (also without spaces) under Components > Portfolio Manager > Projects > Option (Top right).
If you want, you can check out our documentation regarding adding the API key here:
downloads.eleopard.in/portfolio-manager-documentation.html to understand how to do the same.