Error 501 while updating YouTube

I have had a problem with Youtube which stopped after a minute or two. Message was not connection to server lost. Cannot remember exact words but Touch to Retry appeared at end of message. I have been onto Google Forum and followed some suggestions like change date and untick Auto date and time. Restart and clear youtube cache. Also did a Force Stop. Restarted and tried to update youtube but received the error 501.

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References talk.sonymobile.com/t5/Xperia-M4-Aqua/Error-501-while-updating-YouTube/td-p/1051293

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