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Question SyntaxError: Unexpected token < in JSON at position 0



New Member
Whenever I want to edit my homepage built by Elementor the screen keeps on loading (see image) & I'm presented with the following error:
post.php?post=174&action=elementor&elementor-mode=safe:1 Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0
I have tried to disable all plugins except elementor, but the error is still present, any ideas?

Schermafbeelding 2020-09-26 om 12.16.28.png
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