Error message #300

Hi everyone,
I am new to embroidery. I just bought a machine from SWF T1501C. I am having a difficult time getting it to sew. I keep getting this error message 300; (Needle position signal does not vary). Can someone help me with this? I went to the 2 day training for the machine but I really don't think that was enough to get me started. I would really appreciate some help here. I just want to get some stitches done for the first time. I have had the machine about a week now and I haven't been able to do anything with it. I have been trying to read through the book but its not sinking in. I am more of a hands on or if you can talk me through it, I can get it done.

thanks,
Juan