HA Application Monitoring API Error Messages The vSphere infrastructure can return errors in HA Application Monitoring Error Codes as a result of HA Application Monitoring calls. HA Application Monitoring Error Codes Error Message Data Type Code Description VMGUESTAPPMONITORLIB_ERROR_SUCCESS int 0 Call completed successfully. VMGUESTAPPMONITORLIB_ERROR_OTHER char Unknown error. VMGUESTAPPMONITORLIB_ERROR_NOT_RUNNING_IN_VM char Calling application is not running within a virtual machine. VMGUESTAPPMONITORLIB_ERROR_NOT_ENABLED char Monitoring is not enabled. VMGUESTAPPMONITORLIB_ERROR_NOT_SUPPORTED char Monitoring is not supported.