[Paraview] Error when using divide (/) in calculator

[Johnny]

Hi all,
 
I was trying to do a calculation like scalar_a/Scalar_b, 
 
error occurred: 
ERROR: In /home/berk/Work/ReleaseBuilds/ParaView3/VTK/Common/vtkFunctionParser.cxx, line 1292
vtkFunctionParser (0x99e1368): Syntax error: input to math function not in parentheses; see position 3
 
And I tried a simpler one, just to divide by a number, like scalar_a/2,  It has the same error. 
Could anyone tell me what's going wrong here? 
 
Thanks a lot!!

Jiangning

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