Use the same variable in 2 blueprints

I have a blueprint called Coins which holds the variable I want to use - http://prntscr.com/8q8kd6

I want to access this variable in a blueprint called Coins_GUI. This is my current method - http://prntscr.com/8q8j7u

When I run the script I get the following error - http://prntscr.com/8q8ksw

Thanks in advance to anyone who can help me