"Exception caught by adapter framework: error while processing message to remote system:com.sap.aii.af.rfc.core.client.RfcClientException: resource error: could not get a client from JCO.Pool: com.sap.mw.jco.JCO$Exception: (106) JCO_ERROR_RESOURCE: Connection pool RfcClient[SAPAPO_FORECAST_WRITE_RFC]90ff38d484b93369ba2be3de549d21b4 is exhausted. The current pool size limit (max connections) is 1 connections."
what does this error imply?