EndNote X7 - "Encountered an improper argument" error

I am trying to insert additional references, but get multiple error messages, as cited in the subject line.

I have the same problem in a blank document.

I have tried the sugegsteion to “repair” the program, but  get the message, repeatedly, that Endnote is unable to do this, even though I closed the application.

Pleae offer a solution. so I stop wasting my time.

Regards,

Hans