"Reference limit has been reached" problem

Hello there!

It was only yesterday that I tried to add references in both
of my
Endnote X libraries and I couldn't manage to do it.

The "New Reference" button was not shown as
active.

I tried to copy and paste an existing reference but the
error message
"Reference limit has been reached. Cannot add more
references to this
database" was occuring.

It seems that I cannot edit existing references either!

Does anyone know what would this mean? Did anyone have any
similar
problems with Endnote X?

I am looking forward to your responses.

Yours,

Y.K

Mechanical Engineering Instructor
MBA Educational Management Candidate