Error with classifier (boost): tlsKey != TLS_OUT_OF_INDEXES in function cv::TlsAbstraction::TlsAbstraction

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Hello everybody,

I use mexopencv in Matlab in order to use OpenCV functionality.

I use a classifier (boost) that I call many many times. Unfortunately, from time to time (usually after days/weeks and many thousands of classifier calls), I get an erratic error from OpenCV.

The error that shows up is

What() is:C:\builds\master_PackSlave-win64-vc12-shared\opencv\modules\core\src\system.cpp:968: error: (-215) tlsKey != TLS_OUT_OF_INDEXES in function cv::TlsAbstraction::TlsAbstraction

Does anybody know what does it mean?

How can it be prevented?

What is the source of the error?