Can't export/copy paste out of one file

Hi, I have a scrivener file open with multiple sections under the binder. I’m currently using one section and cannot copy paste out of the file, cannot export the file. I can still write in it. I’ve tried exporting/copy pasting other sections within the same project and they seem to be working fine, it is just this section. Since this is a paper I have to submit by next wednesday, I’m really hoping to resolve this! Any suggestions?

What is the wording in the error message you get when trying to export? Or if there is no error message, what precisely happens—and what do you mean by copy and paste not working? From one paragraph, two, the whole thing? Does dragging the text to another file work?