[Evolution] Evolution issue or Flatpak issue

[Anonymous Japhering <japhering gmail com>]

I run  the flatpak version of Evolution, only because Linux Mint native is so far behind and has soo many issues for me.

Linux Mint

Distributor ID: LinuxMint
Description: Linux Mint 19.3 Tricia
Release: 19.3
Codename: tricia

Linux  5.4.0-52-generic #57~18.04.1-Ubuntu SMP

Flatpak 1.8.2

Evolution  3.38.2 (flatpak gitcf56856)

Evolution crashed ( it happens every so often).  So I killed the flatpak remnants and rebuilt the 

the environment, as I do everytime it crashes.  

This time, however,  when restarting I get 4 sets of the error message below:

(evolution-source-registry:14): e-backend-WARNING **: 16:31:13.557: Failed to move '/home/mhm/.var/app/org.gnome.Evolution/cache/evolution/mail/fd637cd8a03e065bf4072184cc79851443947c26': Error moving file /home/mhm/.var/app/org.gnome.Evolution/cache/evolution/mail/fd637cd8a03e065bf4072184cc79851443947c26: File exists

All varying by the file name.   4 is significant as that is the number of different email addresses I pickup,  and which when evolution starts,  it does so by asking me  configure/import  mail accounts.

Just to verify,  to me it looks like the message is originating from Evolution and not Flatpak, am I correct?

Any idea if  removing the 4 files in question would fix, at least for the time being,  the issue or make it worse ?

Thanks.

Mike