OSS End point manager - Issues after Freepbx Upgrade


We are using OSS End Point manager and we upgraded to Freepbx 13 recently. We are getting the following error since then when we try to submit changes with “Extensions”.

Whoops \ Exception \ ErrorException (E_WARNING)
copy(config_bkup/contacts/000000000000-directory.xml.1511389593): failed to open stream: No such file or directory

Permissions are correct and I see that both config_bkup and contacts are present in /tftpboot.
Contacts is not under config_bkup as the above error shows.

I know that OSS is not a supported module but wanted to check if some other user has experience with this and has a possible solution for the same.