AI CUBE 训练线程工作异常（maincontroller.py 4746: 'NoneType' object is not subscriptable)

重现步骤
使用例程中的图像数据集做分类训练，在训练这一步，出现错误提示。

特别检查过所有的文件路径，没有发现空格，中文等。

log文件输出如下：

2025-03-21 20:11:58,978: INFO AICube.py 154: license校验通过！
2025-03-21 20:11:59,850: INFO AICube.py 161: GPU环境检查通过！
2025-03-21 20:15:16,215: INFO maincontroller.py 4746: 'NoneType' object is not subscriptable
2025-03-21 20:15:16,215: INFO maincontroller.py 4747: 训练线程工作异常！
2025-03-21 20:15:16,215: ERROR maincontroller.py 4748: NoneType: None

2025-03-21 20:17:10,798: INFO maincontroller.py 4746: 'NoneType' object is not subscriptable
2025-03-21 20:17:10,798: INFO maincontroller.py 4747: 训练线程工作异常！
2025-03-21 20:17:10,798: ERROR maincontroller.py 4748: NoneType: None

2025-03-21 20:20:20,446: INFO maincontroller.py 4746: 'NoneType' object is not subscriptable
2025-03-21 20:20:20,446: INFO maincontroller.py 4747: 训练线程工作异常！
2025-03-21 20:20:20,446: ERROR maincontroller.py 4748: NoneType: None

2025-03-21 20:20:24,446: INFO maincontroller.py 4746: 'NoneType' object is not subscriptable
2025-03-21 20:20:24,446: INFO maincontroller.py 4747: 训练线程工作异常！
2025-03-21 20:20:24,447: ERROR maincontroller.py 4748: NoneType: None

2025-03-21 20:23:59,605: INFO maincontroller.py 4746: 'NoneType' object is not subscriptable
2025-03-21 20:23:59,605: INFO maincontroller.py 4747: 训练线程工作异常！
2025-03-21 20:23:59,605: ERROR maincontroller.py 4748: NoneType: None

2025-03-21 20:25:51,326: INFO maincontroller.py 4746: 'NoneType' object is not subscriptable
2025-03-21 20:25:51,326: INFO maincontroller.py 4747: 训练线程工作异常！
2025-03-21 20:25:51,327: ERROR maincontroller.py 4748: NoneType: None

期待结果和实际结果

软硬件版本信息
AIcube 1.4

错误日志

尝试解决过程

将AIcube拷贝到c:盘， d:盘

补充材料