The Transaction Error History page is almost identical to the History page, except that it only shows transactions flagged by FusionReactor as being in error.
For WebRequest transactions, what constitutes an error is - by default - HTTP return codes 500-599.
This setting can be changed in FusionReactor > Settings > Error Settings, and is described in Settings.
Other transactions may also be detected as erroneous:
JDBC requests which contain syntax errors.
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