.. include:: /Includes.rst.txt ========================== TYPO3 Exception 1255072832 ========================== .. include:: /If-you-encounter-this-exception.rst.txt The form field "[items][][]" is invalid. ======================================== **The form field "[items][][]" is invalid. Reason: "[]" used not as last argument, but somewhere in the middle (like foo[][bar]).** The value of "**name**" is missing in the form field. For example at the selecting field: :: The error also occurs having a Fluid template like :: When you select a checkbox and submit the from, you will receive the error message. **Solution:** Adding a counter/id in the brackets of the name attribute solves the problem: :: . Since in the form.checkbox documentation the examples are given with empty brackets, I consider this a bug.1 **Better solution (since TYPO3 7):** Do not add yourself [] to the name of the checkbox. Simply add multiple="1" and Fluid will adds automatically the [] to all the checkbox of the group. ::