hello. now i have a maxon motor and a epos2 50/5. so,i want to using the package epos_hardware i download from the github. but when roslaunch example.launch,it tells me :

[INFO] [1538901368.309748]: Controller Spawner: Loaded controllers:jointstatecontroller, velocitycontroller [ERROR] [1538901370.613193819]: Could not configure motor: myjoint_actuator [FATAL] [1538901370.613278445]: Failed to initialize motors

but i have check ,when rosrun eposhardware listdevices,it shows:

---

## Listing Devices:
EPOS2
    MAXON SERIAL V2
        USB
            USB0
                Baudrates:
                    1000000
                Devices:
                    Node Id: 1
                        Serial Number: 0x602068008589
                        Hardware Version: 0x6322
                        Software Version: 0x2126
                        Application Number: 0x0
                        Application Version: 0x0
    MAXON_RS232
        RS232
            Skipping RS232
    CANopen
Could not get interface names: Bad Parameter
EPOS
    MAXON_RS232
        RS232
            Skipping RS232
    CANopen
Could not get interface names: Bad Parameter
 ##

so,have anyone can give me some help! thanks,thanks!!!