Endnote X8 Error help Please!~

Hi all, 

My X8 desktop is showing I have 4200 references all together but it isn’t showing any references, I can search with author name and specific reference will turn up but when I go back to show all nothing comes up. And the dialogue box of “Endnote error” keeps popping up. 

Also, when I try to import references directly from the internet, it keeps asking me to choose an import filter and ending up not importing anything. 

I tried syncing with the online library to get the previous version but nothing is coming up, what is happening? And how can I solve the issue?

Thanks for all the help.