To avoid this error, only copy content from a plain text editor like Notepad or Notepad++. This does mean that you'll lose some formatting; however, this will resolve your issue of going over the allotted character limit.
Note:
Some special characters encode into HTML upon input to a RTA field, even when copied from a neutral editor. For example, a single apostrophe will encode to the equivalent of 5 characters, resulting in a net gain of 4 characters. This should be taken into account when considering field length settings and character limits.
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