Hi,
it would be really great if you could post code instead of images. If anyone wants to help, they have to retype everything.
Also it is much more difficult to spot mistakes, like the curley brackets you use for x-1 and x+1. If you correct that
<< VectorFieldPlots`
GradientFieldPlot[1/Sqrt[(x - 1)^2 + y^2] - 1/Sqrt[(x + 1)^2 + y^2], {x, -2, 2}, {y, -2, 2}, PlotPoints -> 20]
should work.
Best wishes,
Marco