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I have got a really bad memory leak I am trying to fix, but somehow i am not able to delete Objects without triggering this assertation. I have searched for a solution via Google and have read the Questions on stackoverflow about this Error but I was still not able to find the answer! Possible reasons to get this Error according to my research: 1. deleting objects more then one 2. shadow copying 3. creating and deleting Objects that are loaded from an external dll 4. creating objects without storing the pointer BUT: 1. I checked the code and was not able to find double deletion 2. I use a copy constructor to copy Objects 3. The Error relatet classes are build (with MS Visual Studio) to a seperate lib but not to a dll. AND all the classes that are related to this error are located in the same lib. 4. I checked the code and it seems like that's not the problem It would be great if anybody is able to spot the mistake in the code below, and I appreciate every hint that points me to the solution of the problem. EDIT: I forgot to mention the same deleting problem in sendThreadMain of MessageSystem (see code below). If i delete the Message there it causes unexpected errors somewhere else in the code. Might just be wrong data transmission... but i do not really know. This code is run on Windows and Linux! Here are the error related parts of the code: Message class Message { public: Message (char type, unsigned char id, unsigned short size) { mType = type; mId = id; mSize= size; } Message(const Message &o) { mType = o.mType; mId = o.mId; mSize = o.mSize; } char getType() const {return mType;}; unsigned char getId() const {return mId;}; unsigned short getSize() const {return mSize;}; protected: char mType; unsigned char mId; unsigned short mSize; }; class Jo

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