When the android project is imported, the cocould not write file ....... Classpath error Solution

When I made another android 3D 360-degree panorama yesterday. The project list has no errors. However, this prompt box error occurs.

Note that the. classpath environment file cannot be written. Then, check the properties of the. classpath file and. project file in the main directory of the project file, and find that the two properties are hidden. After the hidden properties are removed, this problem is solved. Likewise, these two files cannot be read-only.

If this problem is not solved, the execution of the program will not be affected, but an error will be reported when running the program. That is, classnotfoundexception error.