cscope fail for search reference
**Environment Information**
OS:WIN10
VIM: 8.2
NEOVIM : 0.4.3
SPACEVIM: 1.8
PYTHON: 3.8.1
:[SPC]mgcr , message show "Vim(let):E716 Key not present in Directory:D_projectdir"

It seems no tags tools can be used in such env, hope author can fix it ASAP. @wsdjeg 