Mergevec.cpp possible alternative

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Hi everyone!! As i was unable to get mergevec.cpp to compile, i've thought of instead of trying to merge two .vec, why not put together a .txt with the contains of two .txt

For example: i have two folders A and B, and after object-marking them i got two .txt, a.txt and b.txt // Why not creating an output.txt? The thing is, it works when creating the sample, but when i try to train them, it gives out the error: OpenCV Error: Assertion failed (tempNode->left) in write (...)

Please, any tip at all would be welcome :) Thanks.