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The error message may appear when reading message is obscure. It appears when trying to read an attribute from a faulty Pool device.
The basic problem is that the connection between the Pool device and the Tango device is
is somehow broken.

Reasons that have been observed so far:

  • the online.xml entry describing the Pool device has a typo on in the device name or the typo 
    happened when the device was created using jive
  • The Tango server was not running while was executed. 
    Btw.: if the Tango server has been stopped after has bee executed,
    an access to the corresponding Pool device will throw the meaningful error: 
    'Device <devName> is not exported'