Today I received an error message for a script font I tried uploading again called "Caroline".

I have it here if you want to know which one ... https://www.creativefabrica.com/product/caroline-2/

The response was:

"Space glyph unset, or too much small/large"

Which one was it? It looks like I have a space glyph, was it encoded wrong? Was it too small or too large?

The space glyph is indeed too large.

On a side note, you would save a lot of time adjusting the spacing to make sure characters connect to each other, instead of adding kerning afterwards, especially in a font like this.