We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
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Also, never use the editor. Did you never come across that mantra here on the forums? I myself am posting this at least once a day. NEVER USE THE EDITOR.
All game files (including the scenarios) are in easy to understand text format. You can easily find the "alliance = {" part and just delete it.