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On my RUT950 I'm downloading the backup configuration file, unpacking it, archiving it again with this command on my mac:
tar -czvf backup-Teltonika-2020-03-13.tar.gz backup-Teltonika-2020-03-13
Then I'm trying to upload this file but I get the following error
"/usr/lib/lua/luci/dispatcher.lua:217: Failed to execute call dispatcher target for entry '/admin/system/admin/backup'.

The called action terminated with an exception:
/usr/lib/lua/luci/controller/admin/system.lua:192: attempt to perform arithmetic on a nil value
stack traceback:
	[C]: in function 'assert'
	/usr/lib/lua/luci/dispatcher.lua:217: in function 'dispatch'
	/usr/lib/lua/luci/dispatcher.lua:93: in function </usr/lib/lua/luci/dispatcher.lua:93>"

What is causing this issue?

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Hello!

Are you trying to upload backup file to the same router?

Best regards, Aliaksandr!