Fatal error: 'i2c-lcd.h' file not found

I have created a project on KEIL IDE from cubeMX. I wanted to copy file .h and .c from i2c library but I got the following error attached on the screen and I do not know what can be the source of the problem.

Does someone have an idea on what is going on?
Thanks in advance.

You have add your .h files to Include path. For that, you have to update your projects settings.

Go to, Options for target → C/C++ → Include path) to add all your paths and include i2c-lcd.h

Thanks this default has desappeared.