From the thread stacktrace, this bit looks it might be relevant:
"RXTX fhs_lock() Error: creating lock file: /var/lock/LCK..ttyUSB2: File gi\303\240 es"
From the thread stacktrace, this bit looks it might be relevant:
"RXTX fhs_lock() Error: creating lock file: /var/lock/ LCK..ttyUSB2: File gi\303\240 es"