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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 ua.program_ (https://ssl.gstatic.com/colaboratory-static/common/5f306670f70536bf41306fbeda7c23e1/external_binary.js:2654:128)
    at xa (https://ssl.gstatic.com/colaboratory-static/common/5f306670f70536bf41306fbeda7c23e1/external_binary.js:16:57)
    at ua.next_ (https://ssl.gstatic.com/colaboratory-static/common/5f306670f70536bf41306fbeda7c23e1/external_binary.js:14:195)
    at kaa.next (https://ssl.gstatic.com/colaboratory-static/common/5f306670f70536bf41306fbeda7c23e1/external_binary.js:17:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/5f306670f70536bf41306fbeda7c23e1/external_binary.js:17:309)
 OK