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Unexpected token '<', "<!DOCTYPE "... is not valid JSON

Unexpected token '<', "<!DOCTYPE "... is not valid JSON
SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
    at JSON.parse (<anonymous>)
    at ra.program_ (https://ssl.gstatic.com/colaboratory-static/common/806f9dcd25281c9b1b7000a7edd7e853/external_binary.js:2748:128)
    at ta (https://ssl.gstatic.com/colaboratory-static/common/806f9dcd25281c9b1b7000a7edd7e853/external_binary.js:15:57)
    at ra.next_ (https://ssl.gstatic.com/colaboratory-static/common/806f9dcd25281c9b1b7000a7edd7e853/external_binary.js:13:196)
    at raa.next (https://ssl.gstatic.com/colaboratory-static/common/806f9dcd25281c9b1b7000a7edd7e853/external_binary.js:16:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/806f9dcd25281c9b1b7000a7edd7e853/external_binary.js:16:309)
Copy error OK