failed open dashboard

[Manssizz]

error showing below

/usr/lib/lua/luci/controller/rebootmodem.lua:8: attempt to call method 'get' (a nil value)
stack traceback:
	/usr/lib/lua/luci/controller/rebootmodem.lua:8: in function 'v'
	/usr/lib/lua/luci/dispatcher.lua:580: in function 'createtree'
	/usr/lib/lua/luci/dispatcher.lua:246: in function 'dispatch'
	/usr/lib/lua/luci/dispatcher.lua:129: in function </usr/lib/lua/luci/dispatcher.lua:128>