LuCI homepage collapsed itself - why?

Installing and Using OpenWrt
1 
/usr/lib/lua/luci/dispatcher.lua:560: bad argument #1 to 'pairs' (table expected, got nil)
stack traceback:
   [C]: in function 'pairs'
   /usr/lib/lua/luci/dispatcher.lua:560: in function 'createtree'
   /usr/lib/lua/luci/dispatcher.lua:220: in function 'dispatch'
   /usr/lib/lua/luci/dispatcher.lua:141: in function </usr/lib/lua/luci/dispatcher.lua:140>

EDIT:

PUTTY added somehow extra '	Single quote	U+0027 to /config/firewall , and config/openvpn
[SOLVED]
2

have currently the same problem. But no idea how to find the problem.

3

ok, found the solutions: rm -r /tmp/luci-indexcache

hint from: https://blog.hkstem.club/2018/01/openwrt-usrliblualucidispatcherlua582.html

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