Endnote 20 giving "endnote error" when trying to insert citation in Word

I have a paper I was working on another computer, and was able to convert the endnote library (formerly X7?) to my new computer. 

I just added a new citation to my endnote library, but when I try to enter it into the word document, I keep gettin gan “endnote error” message. 

Please help! I need step by step instructions, as I am not terribly proficient in the program. 

Thank you in advance for any help!