Check writer (C++)

[tamale21]

Can someone please help me with my coding for a c++ program where it changes an number to print out the numeric value in letters as a string?
I keep getting an error message but am unsure what is wrong.

Edit:
I tried uploading my file onto here but didn't allow me so here is a link to where my file are able to be seen.

https://forum.freecodecamp.com/t/check-writer-c-help-please/63841