I created an Android developer project related to Android. When I run my code, I got this exception. Can anyone tell how I can solve this problem. thanks a lot
com.google.api.client.googleapis.json.GoogleJsonResponseException: 503 Service Unavailable {"code": 503, "errors": [{"domain": "global", "message": "javax.persistence.PersistenceException: no duration providers available for "JPATest" after trying the following discovered implementations: org.datanucleus.api.jpa.PersistenceProviderImpl "," reason ":" backendError "}]," message ":" javax.persistence.PersistenceException: there are no duration providers available for "JPATest" after trying the following discovered implementations: org.datanucleus.api.jpa.PersistenceProviderImpl "
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