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Jenn DouglassJenn Douglass 

Is Salesforce encountering and issue in their system or am I doing something wrong?

I'm attempting to complete the Sharing Rules Challenge in Trailhead on the Admin Intermediate Trail, but when I try and create the custom field type as Picklist, it doesn't allow me to select a global picklist in the dropdown box, but keeps telling me
"Error: A global picklist definition must be selected"

The box only gives "none" as an option.  User-added image
Nayana KNayana K
Go for second option --> Enter values for the picklist, with each value seperated buy a new line and enter following values:
High
Medium
Low

If you want to use global picklist option :
https://releasenotes.docs.salesforce.com/en-us/winter16/release-notes/rn_forcecom_general_global_picklists.htm