[maxmsp] "Can't fragload plugin-err-4" message -???

Hello,
I am trying to load a vst plugin in vst~ object in Max
4.6 and I get that message "Can't fragload
plugin-err-4" message ", 
what is the problem, what can be wrong, 
My vst file is in the search path in VST plugins
folder in Max folder .
Thanks
Anya

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