error -200428 in LV 8.6 but not in LV 8.0

[WCR]

Moved a data acquisition VI from computer with LV 8.0 to one with LV 8.6. 

An error occurs on the new system which doesn't occur on the old:  "Error -200428 occurred at Property Node DAQmx Read (arg 1) in Four Channel Analog Collection.vi".  The help for the error says: "Measurements: Value passed to the Task/Channels In control is invalid.  The value must refer to a valid task or valid virtual channels."  Why isn't the acquisition task a valid task?  It seems to be valid in 8.0.

The VI is attached.  It was saved in LV 8.0 compatibility mode, on a LV 8.6 system.

Thanks,

Bill

[AdnanZ · Accepted solution]

Have you setup the Task Four Channels on the new computer? Have a look at the following:

Saving the System Configuration in Measurement & Automation Explorer (MAX)

Also, I would recommend that you consider the Producer/Consumer design pattern where the DAQ can happen in the producer loop and your File I/O in the consumer. To look at a template, navigate to File -> New.. andlook for the Producer/Consumer Design Pattern.

[MattBradley]

Hmmm... it worked under 8.5.  Can you try mass compiling the folder it's in?  Not sure if it will help or not, but it may point in the right direction.

[WCR]

Thank you Adnan & Matt.  I had not defined the task in DaqMX on the second computer.  Once I did, it worked.