I used Spyder for over half year. I used Anaconda Navigator to download python library or modules to my local computer. Specifically, I downloaded Keras and OpenCV under the directory of the environment. Once I finished downloading, I can import those two in python codes. But, few days ago, I suddenly found my icon of Spider is disappeared from the taskbar and I opened Spyder from start of computer. After I opened Spyder this way, those two modules can not be found and error message shown me: "ModuleNotFoundError: No module named 'keras'"