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We failed and could not save the Paypal Signature API data and always appear Disable

Contributor

We failed and could not save the Paypal Signature API data and always appear Disable

Please help :
We failed and could not save the Paypal Signature API data and always appear Disable, could not save to enable.
Our website is only given instructions set:
Username API:
Password API:
Signature API:
display an error message if the save will appear in the billing settings paypal adminpanel our website:
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" Gateway login failed. Please double check your connection information. The gateway has been disabled. The message was: [0] Invalid HTTP response version: 2 "
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We ask for your help and guidance
Thank you