hi, my eggbot pro is not working

my serial port is ok. but somehow its not working. please help.

Inskscape>Extension>EggBot Control>Plot>
and i get this message below (and also with eggbot manual control tab)

Traceback (most recent call last):
File “eggbot.py”, line 1406, in <module>
e.affect()
File “C:\Program Files\Inkscape\share\extensions\inkex.py”, line 268, in affect
self.effect()
File “eggbot.py”, line 281, in effect
self.EggbotOpenSerial()
File “eggbot.py”, line 1299, in EggbotOpenSerial
self.serialPort = self.getSerialPort()
File “eggbot.py”, line 1357, in getSerialPort
serialPort = self.testSerialPort( strComPort )
File “eggbot.py”, line 1326, in testSerialPort
serialPort = serial.Serial( strComPort, timeout=1 ) # 1 second timeout!
File “C:\Program Files\Inkscape\share\extensions\serial\serialwin32.py”, line 30, in __init__
SerialBase.__init__(self, *args, **kwargs)
File “C:\Program Files\Inkscape\share\extensions\serial\serialutil.py”, line 260, in __init__
self.open()
File “C:\Program Files\Inkscape\share\extensions\serial\serialwin32.py”, line 56, in open
raise SerialException(“could not open port %s: %s” % (self.portstr, ctypes.WinError()))
UnicodeDecodeError: ‘ascii’ codec can’t decode byte 0xc1 in position 10: ordinal not in range(128)