It's hard to see the Label when you are inside the jar!
For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
Só hoje fui ver sua mensagem no privado...
Geralmente não acesso essa parte do fórum...
Mas, se ainda estiver precisando de ajuda, e eu puder ajudá-lo, conte comigo...