Couldn't load the schema for the database model

[blackshep01]

My user gets this error when I share a dashboard with them.  The are outside the organization.  Do they need to have a Power BI Pro licence?  Please help.

Couldn't load the schema for the database model

Couldn't load the model schema associated with this report. Make sure you have a connection to the server, and try again.
Please try again later or contact support. If you contact support, please provide these details.

Activity ID4d94e96a-98c7-4c5a-915c-85b4c7ee04c6

Request ID5ae513f7-b24d-c694-7a5b-e39503f247a6

Correlation ID9e0b8a52-a42a-713a-53e8-981073e4052f

TimeThu Mar 23 2017 12:23:42 GMT-0700 (Pacific Daylight Time)

Version13.0.1700.1501

Cluster URIhttps://wabi-west-us-redirect.analysis.windows.net/