How to solve the: "Error using comm.QPSKModulator" ?

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NIR
NIR 2013-2-25
I get this error in a fresh installed MATLAB 2012b:
Error using comm.QPSKModulator
The specified superclass 'matlab.system.SFunSystem' contains a parse error or cannot be found on MATLAB's search path, possibly shadowed by another file with the same name.
I get the same error in other functions from the Communications toolbox but not all the functions. Someone know how can I solve it?
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NIR
NIR 2013-2-28
As an extra information for this problem: it happens in 32bit and 64bit version.
NIR
NIR 2013-2-28
编辑：NIR 2013-2-28
uninstalling R2012b and installing MATLAB R2011b also didn't work Maybe it is something related to the windows path? and not Matlab path and also I tried to find reference to this:
'matlab.system.SFunSystem'
but didn't find anything.

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