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DLPNIRSCANEVM: Absorption readings file not found

Part Number: DLPNIRSCANEVM

Hello,

We have recently purchased a DLPNIRSCANEVM. 

I will use it for on field measurement on plant juice

But my problem isthe following one : 

the calibration always works, but sometimes i see this error message (please look at the picture), and when i see this message i unplug & replug the usb, to do other calibrations and so on, but the message still appears

If i try few days later the (as today), the scan works perfectly

how am i supposed to solve this problem?

why does it happen ?

In such conditions it is totaly impossible for me to do my measurements

Respectfully

Martin