When does this error show up?

Typically when using the Edit All feature in the Store Editor.
 

What causes the error?

Pasting rich text--that is, text with bold, italic, color, or other styles applied--into one or more text fields in the Edit All screen.
 

How do I prevent error 905?

You must make sure that the fields you are updating receive only plain text. There are three ways to do so:

1. Manually type the data into each field.
2. Sanitize your text before pasting (more on this below).
3. Update your items using CSV upload.
    

How do I sanitize text?

1. Copy the text you want to paste into your item(s).
2. Paste that text into a plain text app, such as Notepad or BBEdit.
3. Copy text from the plain text app--this step is important.
4. Paste the copied text into your item(s).