Cause 2: Please make sure that the expected DLL is loaded with matched debug symbol file. You can check it with Modules window.
原因2：请确认所期望的DLL已经被载入对应的调试符号文件，您可以在模块窗口中检查。
Modules window, right-click any module.
“模块”窗口中右击任一模块。
Modules window, right-click a module for which symbols have not loaded.
“模块”窗口中，右击还未加载符号的模块。
Modules window, you can see which modules have debugging symbols loaded.
“模块”窗口中，可以看到哪些模块加载了调试符号。
Modules window, you can see which modules have debugging symbols loaded.
“模块”窗口中，可以看到哪些模块加载了调试符号。
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