instalation error

When installing Linux server at RaspberryPi Model B+ I used this steps:
Installation is simple, figure out the architecture of your server device (for example x86_64), then on the linux server device:
1.wget http://www.virtualhere.com/sites/default/files/usbserver/vhusbdx86_64 (e.g x86_64, see list below)
2.chmod +x ./vhusbdx86_64 (to make that file executable)
3.sudo ./vhusbdx86_64 -b (to run it in the background)

but when running the last step, the system show this error:
pi@raspberrypi:~ $ sudo wget http://www.virtualhere.com/sites/default/files/usbserver/vhusbdx86_64
--2017-10-02 07:52:33-- http://www.virtualhere.com/sites/default/files/usbserver/vhusbdx86_64
Resolving www.virtualhere.com (www.virtualhere.com)... 162.243.139.213
Connecting to www.virtualhere.com (www.virtualhere.com)|162.243.139.213|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2678040 (2.6M) [application/octet-stream]
Saving to: ‘vhusbdx86_64’

vhusbdx86_64 100%[====================================>] 2.55M 462KB/s in 7.2s

2017-10-02 07:52:49 (362 KB/s) - ‘vhusbdx86_64’ saved [2678040/2678040]

pi@raspberrypi:~ $ sudo chmod +x ./vhusbdx86_64
pi@raspberrypi:~ $ sudo ./vhusbdx86_64 -b
./vhusbdx86_64: 1: ./vhusbdx86_64: Syntax error: word unexpected (expecting ")")
So who is this error?
and above all, how I can solve it