Here is the easy trick to use vestaCP control panel file manager.
Install Free File Manager VestaCP
vesta file manager
vesta web file Manager plugin
How to Install Vesta Cp file Manager Free
Step 1: Loging Using ssh with root user
Step 2: Open vesta.conf file
Using this command
vi /usr/local/vesta/conf/vesta.conf
Press insert key and edit this file
step 3: Add FILEMANAGER_KEY='ILOVEREO' line
Step 4: Press Ctrl+X and write :wq
Step 5: login vestacp control panel and check.
You can enjoy filemanager of vesta control panel for free
**** Note vesta automatically remove this code after 24h *****
If you need to fix this problem i will help and use for life time free.visit
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