Multpile SDRplay API Error

I got a RSP1A and RSPDX from SDRplay.
I work on archlinux using GNUradio companion and am creating my own radio.
The objective is to make both receivers to look at different frequencies in the same time.
They both work perfectly alone with my radio, but if i try to launch them simultaneously, this error pops for the last one launched :

gr-osmosdr 0.2.0.0 (0.2.0) gnuradio 3.8.1.0
*built-in source types: file rtl rtl_tcp uhd hackrf bladerf rfspace airspy soapy redpitaya *
[INFO] devIdx: 1
[INFO] hwVer: 255
[INFO] rspDuoMode: 0
[INFO] tuner: 1
[INFO] rspDuoSampleFreq: 0.000000
[INFO] Using format CF32.
gr-osmosdr 0.2.0.0 (0.2.0) gnuradio 3.8.1.0
*built-in source types: file rtl rtl_tcp uhd hackrf bladerf rfspace airspy soapy redpitaya *
[INFO] devIdx: 0
[INFO] hwVer: 4
[INFO] rspDuoMode: 0
[INFO] tuner: 1
[INFO] rspDuoSampleFreq: 0.000000
[INFO] Using format CF32.
[ERROR] error in activateStream() - Init() failed: sdrplay_api_Fail

This example launches both sources in the same radio block file, but it does not work either if i launch them from 2 separates radio blocks simultaneously.
I don’t have any clue of what to do next and i believe the API is up to date since i downloaded everything for this application.
Any suggestions ? Thanks a lot !!