Step 1 is to verify you have a directory and file off of the Workspace/project folder/Common.
I also noticed that just below the #include “../Common/fonts.h” you have a line that includes another fonts.h. Are they the same file? If so you will get complaints about duplicate definitions. If the fonts.h file you are using is in conjunction with using the LCD screen utilities, the utilities folder needs to be copied over to your project and paths set to the various folders.