Global persistence.cpp:505 open Can't open file in read mode

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4

as berak it seems a file not found or file already opened error :

            file = fopen(filename.c_str(), !write_mode ? "rt" : !append ? "wt" : "a+t");
            if (!file)
            {
                CV_LOG_ERROR(NULL, "Can't open file: '" << filename << "' in " << (!write_mode ? "read" : !append ? "write" : "append") << " mode");
                return false;
            }
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