Steam plotting of vector field showing empty output

I am trying to plot the stream lines for a vector field function, whose definition is exported to the wdx file uploaded here. The following simple code returns an empty plot:

ReadyFieldXY =  Import["C:\ReadyFieldXY.wdx"]; a0 = 0.00055; StreamPlot[Abs[ReadyFieldXY], {x, -a0/2, a0/2}, {y, -a0/2, a0/2}] 

enter image description here

I am not sure what is wrong here. Any suggestions would be appreciated.