Upgrade to concrete 8.3, I can't see the blocks from ADD Blocks

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I had a forced update with many problems due to incompatibility with php 7.2, however, it was possible to achieve it but now it is impossible for me to see the blocks from the edit tab, I cannot add my basic blocks that are already installed, the person who developed the page leave it and I am trying (Im new in concrete5) please help! thanks!

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