-bash: export: `Drive/Courses/Programming/nand2tetris/tools': not a valid identifier Every time I log in to the terminal, I get this error.

-bash: export: `Drive/Courses/Programming/nand2tetris/tools': not a valid identifier
-bash: export: `Drive/Courses/Programming/nand2tetris/tools': not a valid identifier
-bash: export: `Drive/Courses/Programming/nand2tetris/tools/:~/Users/nikhilagrawal/Google Drive/Courses/Programming/nand2tetris/tools/': not a valid identifier
-bash: export: `Drive/Courses/Programming/nand2tetris/tools/': not a valid identifier
It sounds like either your $PATH has been changed. 

Here is a link to reset your $PATH: https://superuser.com/questions/121870/how-do-i-reset-the-path-variable-on-mac-os-x