PTO Carryover throwing error that it cannot find Global Value used in accrual formul

I've set up a new accrual plan that is based on number of employees and number of hours worked.

For example:

     If location has 0 to 24 employes, earn 1 hour for every 87 hours worked with annual max of 24 hours

     If that location has 25 to 99 employees, earn 1 hour for every 43 hours worked with annual max of 40 hours

     If that location has >99 employees, earn 1 hour for every 37 hours worked with annual max of 56 hours

To do this ...

• I set up a Global Value to hold the number of employees.
• I set up user table for how many hours they have to work to earn leave.