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Magento 2 : How to solve Exit with code 1 due to network error: ProtocolInvalidOperationError?

Magento 2 : How to solve Exit with code 1 due to network error: ProtocolInvalidOperationError?

-->we have tried to create pdf using "mikehaertl/phpwkhtmltopdf" and "mpdf/mpdf" liberary.

Exit with code 1 due to network error: ProtocolInvalidOperationError

https://i.imgur.com/68jmTrh.png

https://i.imgur.com/romg323.png