Fonts should be embedded for any text that may be edited at runtime, other than text with the "Use Device Fonts" setting. Use the Text > Font Embedding command to embed fonts.
Research done:
The above link gives a good direction (in the answers) for the problem:
Snippet:
...You can also get this error if you try to dynamically assign a variable to an object that doesn't naturally accept one like a textField.
So I have to click on the movieclip containing the text and then click on text and embed it.
But it still gives the error when I have clicked all the required symbols pressed ok and rerunned the movie?
It's probably very simple but i couldn't find out how to make the embed "stick" because each time I retry to embed it the selections are gone...?