Raise error when edit in CtrlP

[jtr109]

vim version

neovim v0.2.1-dev

Problem

The error

Error detected while processing function <SNR>61_changesurround[9]..<SNR>61_dosurround:
line 41:
E21: Cannot make changes, 'modifiable' is off

will raise when using CtrlP and typing 'cs' in the commend of CtrlP.

vim config

Here is my vim config file.

Thanks a lot!

[elithecho]

getting this too, following