Error when calling SQLview via the api

Hi Devs

I experiencing this error when trying to call a sqlview via the API.

http://localhost:9090/dhis/api/sqlViews/UID/data.json?criteria=ou_uid:UID&criteria=period_iso:201511

409,"status":"ERROR","message":"Criteria params are invalid: [ou_uid, period_iso]"}

the columns used for the criteria filtering are in the sqlview. Am i doing something incorrectly.

Regards
Pooben

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