The problem may be how Windows handle audio drivers (WASAPI).
Go to the Windows "Environment Variables" screen and set DAUDIO_WASAPI_NON_EXCLUSIVE from ON to OFF. If you can not see this line, please add it.
Now the “Error during measurement (Not ready)” message should hopefully be gone.
NOTE: If the error is still there, delete the DAUDIO_WASAPI_NON_EXCLUSIVE variable, restart the computer and try to complete the measurements once more.