TYPO3 Exception 1481464101¶

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The cause of this error is the FlexForm file itself. Especially when plugin options are defined under display conditions within <AND> clause.

<settings.subtitle_align>
     <TCEforms>
         <label>Subtitle Alignment</label>
           <displayCond>
             <AND>
               FIELD:settings.subtitle:!=:0
             </AND>
           </displayCond>
       <!-- ....... -->
</settings.subtitle_align>

If there is only a single condition, please avoid <AND> and get rid of the exception.

<settings.subtitle_align>
     <TCEforms>
         <label>Subtitle Alignment</label>
           <displayCond>
               FIELD:settings.subtitle:!=:0
           </displayCond>
       <!-- ....... -->
</settings.subtitle_align>