Related Clues:

• Trial companion
• Certain computer message
• Overthrow, say
• Failing
• 2 + 2 = 5, e.g.
• Typo, for one
• Baseball blunder
• Mishandled fly, e.g.
• Reason to recalculate
• Infielder's mistake
• Unwanted computer message
• Box-score notation
• Minor mistake
• Typo, e.g.
• Good thing not to be in?