When try to compile with gcc, "error: error reading" shown on mac terminal

I'm trying to compile my c file created by MacVim with gcc on Mac terminal, but the screen showed like this:

r_yeh_mbp_2019@Robinsons-MacBook-Pro ~ % cd Desktop              
r_yeh_mbp_2019@Robinsons-MacBook-Pro Desktop % cd Code                 
r_yeh_mbp_2019@Robinsons-MacBook-Pro Code % gcc TheMatingAlgorithm.c
error: error reading 'TheMatingAlgorithm.c'
1 error generated.
r_yeh_mbp_2019@Robinsons-MacBook-Pro Code % 

However, it could be compiled if the file was created by command "vi" on terminal instead of using any other IDE to create(I also tried Atom to create):

r_yeh_mbp_2019@Robinsons-MacBook-Pro Code % gcc SearchAlgorithm.c -o sa.o
r_yeh_mbp_2019@Robinsons-MacBook-Pro Code % ./sa.o  

Also, when I tried to use command "vi" to edit a c file created not by "vi", the terminal created a new file and showed like this:

"TheMatingAlgorithm.c" [Permission Denied]

Any help or comment is greatly appreciated. I've spent half day trying to find a solution by using English keyword and couldn't solve it.