Changed Value to ValueError to properly printout error message (#238)
Changed Value to ValueError to properly printout error message (#238)

Signed-off-by: Yun Rock Qu <fcd83a0693b6a5cb7c9eb4ec7e4efcc1d5362d8c@xilinx.com>
JorisBolsens/PYNQ,Xilinx/PYNQ,yunqu/PYNQ,yunqu/PYNQ,VectorBlox/PYNQ,yunqu/PYNQ,Xilinx/PYNQ,yunqu/PYNQ,VectorBlox/PYNQ,Xilinx/PYNQ,schelleg/PYNQ,schelleg/PYNQ,JorisBolsens/PYNQ,VectorBlox/PYNQ,VectorBlox/PYNQ,cathalmccabe/PYNQ,schelleg/PYNQ,yunqu/PYNQ,cathalmccabe/PYNQ,JorisBolsens/PYNQ,schelleg/PYNQ,schelleg/PYNQ,JorisBolsens/PYNQ,Xilinx/PYNQ,cathalmccabe/PYNQ,JorisBolsens/PYNQ,Xilinx/PYNQ,VectorBlox/PYNQ,cathalmccabe/PYNQ,cathalmccabe/PYNQ,cathalmccabe/PYNQ