Hello, Thank you very much for answering my question, it's very kind of you.
To explain the situation to you, I am replacing a colleague who has left and I have never used this software or language before.
It compiled normally before and suddenly, it shows me this error.
To answer your answer, I don't know how to check the resource and how to install it.
If you could help me please, I don't know what or how to do?