Exception in Tkinter callback\nTraceback (most recent call last):\n File "D:\Anaconda\lib\tkinter\init.py", line 1702, in call\n return self.func(*args)\n File "", line 49, in load_data\n self.nroot_data = pd.read_csv(file_path, encoding='gbk')\n File "D:\Anaconda\lib\site-packages\pandas\io\parsers.py", line 678, in parser_f\n return _read(filepath_or_buffer, kwds)\n File "D:\Anaconda\lib\site-packages\pandas\io\parsers.py", line 440, in _read\n parser = TextFileReader(filepath_or_buffer, **kwds)\n File "D:\Anaconda\lib\site-packages\pandas\io\parsers.py", line 787, in init\n self._make_engine(self.engine)\n File "D:\Anaconda\lib\site-packages\pandas\io\parsers.py", line 1014, in _make_engine\n self._engine = CParserWrapper(self.f, **self.options)\n File "D:\Anaconda\lib\site-packages\pandas\io\parsers.py", line 1708, in init\n self._reader = parsers.TextReader(src, **kwds)\n File "pandas\_libs\parsers.pyx", line 384, in pandas._libs.parsers.TextReader.cinit\n File "pandas\_libs\parsers.pyx", line 697, in pandas._libs.parsers.TextReader._setup_parser_source\nOSError: Initializing from file failed\n这是一个Python中的异常错误，表示在Tkinter回调函数中发生了异常。具体原因是在读取CSV文件时出错，可能是由于文件路径错误、文件不存在或文件格式不正确等原因导致的。建议检查文件路径和文件格式是否正确，并尝试重新读取文件。
