Powerpoint Error

I am unable to open or work in my PPTX file since many of my files the error in the below link is coming. It states

"Powerpoint found a problem with content in "file name.pptx". Powerpoint can attempt to repair the presentation.

If you trust the source of this presentation, click repair."

Once I click repair the following message comes:

"Powerpoint couldn't read some of the content in "file name.pptx - repaired" and removed it.

Please check your presentation to see if the rest of it looks ok."

Powerpoint error - Apple Community