Urbackup client QNAP TS-1635

Hello,
I tried to install the client on a QNAP with CPU AL514 Cortex-A15 and the log shows the following:
ERROR: Error creating pthread. Errno: 22
WARNING: Retrying creating thread for thread pool in 2s…
Error creating pthread. Errno: 22
Retrying creating thread for thread pool in 4s…

Does anyone have any advice please?
Thank you