Memory Error

[michaelbremaa]

MemoryError
Traceback (most recent call last):
File "C:/Users/LENOVO/.qgis2/python/plugins\GeomorphicFloodIndex\doGeomorphicFloodIndex.py", line 713, in accept
tmp=flowacc*numpy.square(cellsize)*numpy.power( (G+0.0001), 1.7)# tmp= (FlowAcc.cellsize^2.(G+0.0001).^1.7MemoryError

I'm having this trouble when running GFA plugin in QGIS 2.14.9. My DEM file is approximately 4gb and the other file needed are 2gb each

Can you explain what's wrong? if its my memory then how much would i need to free if i want it to be executed properly?
Thanks in advance

[michaelbremaa]

I change my file directory to drive D where i have more memory, i got to 99% then i got this error

MemoryError
Traceback (most recent call last):
File "C:/Users/LENOVO/.qgis2/python/plugins\GeomorphicFloodIndex\doGeomorphicFloodIndex.py", line 747, in accept
Y=numpy.zeros((rows,cols))# Y matrix with initial Y coordinate
MemoryError

can someone explain what went wrong? Thanks