Quote:
Originally Posted by Mitchell
What the heck does this error message mean?
用できるのは半角英数小文字とハイフン（ - ）、アンダーバー（ _ ）のみです
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"Able for the case alphanumeric, hyphen (-), underscores (_) only" according to Google Translate. Basically only letters, numbers, hypens and underscores allowed.