What causes this?

Found 2 device(s):
0: Generic RTL2832U OEM
1: Generic RTL2832U OEM

Using device 0: Generic RTL2832U OEM
usb_claim_interface error -6
Failed to open rtlsdr device #0.
Could it be a power issue? Should I use 2 pi’s instead?

You havo to first stop dump1090-fa and dump978-fa to make dongles free, then test.

sudo systemctl stop piaware dump1090-fa dump978-fa   

rtl_test -t -d 0  

rtl_test -t -d 1  

sudo systemctl restart piaware dump1090-fa dump978-fa  

-6 means that the device is already in use by another program.

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