I added the file to libs and imported it to build, but it says the file was not found, what's the matter?

Question

Android

I added the file to libs and imported it to build, but it says the file was not found, what's the matter?
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

implementation files('C:\\Users\\marme\\AndroidStudioProjects\\Nonee\\Location\\libs\\postgresql-42.2.18.jre7.jar')