Need help with initial layer

[mmmmmarto 0]

Hello, 
 

I am new to this forum and I need some help.
The issue I'm having is that when my printer makes the first layer in puts this ugly line across the layer. (picture included). I need a clean first layer as the visual aspects is important in this case.
It starts by doing the walls first and then while it is moving to the filling it looks like it is still extruding while and leaving a line.
I tried adjusting the z hop and retract values but so far I haven't managed to make it work. I also changed the fill pattern and it still does it. 
Does somebody know how I can fix this?


Thank you in advance!