"An unexpected error has occurred. Please reload the page and try again"

Hi,
I have updated OJS from 3.0.2.0 to 3.1.2.1 When I click dashboard as an administrator, I see the “An unexpected error has occurred. Please reload the page and try again” error. I am also not able to see the articles in my queue, unassigned, all active and archives. When I check the errors on ftp, I saw the following lines:

[14-Oct-2019 10:43:20 Europe/Istanbul] Unable to move “/home/ijopr/ijopr_files/journals/1//articles/6//submission/6-1-6-1-2-20171130.docx” to “/home/ijopr/ijopr_files/journals/1//articles/6//submission/6-4-6-1-2-20171130.docx”.
[14-Oct-2019 10:43:20 Europe/Istanbul] Unable to move “/home/ijopr/ijopr_files/journals/1//articles/6//submission/review/6-1-9-1-4-20171130.docx” to “/home/ijopr/ijopr_files/journals/1//articles/6//submission/review/6-4-9-1-4-20171130.docx”.

"/home/ijopr/ijopr_files/journals/1//articles/133…

(all articles from 1 to 133)

I didn’t get what I did wrong. Besides that, I have problems with non-English characters, apostrophe in titles etc. For instance, see the surname of the author (http://ijopr.com/index.php/ijopr/article/view/113)

Kind regards,

mine is i reset the admin password and upon login i got this error


An unexpected error has occurred. Please reload the page and try again.


Kind Regards
Simon