Check file names and version histories carefully. But theres a faster way, you just have to java gradle task your own. It may seem hard to believe that you're reading a different source code than the one producing the error, but it's definitely possible, and especially for new Java programmers. So you keep on Invalidate and Restarting Android Studio over and over again.
You're looking at the wrong source code. Example.java D:>java samp.Example Error: Could not find or load main class samp.Example Caused by: : samp.Example Solution In this scenario we have mention the name of the wrong package While executing we need to specify the correct package name in which the. This problem can be hard to spot, but in this case, if the source files use UTF-8 encoding, you may be using some identifiers as if they're identical but really they're not because they simply appear to be spelled the same. Identifiers look the same but are actually different. The following bit of Java code, for example, wont compile: int a 5. The packaged class has not been referenced correctly using an import declaration. If your preferred version of Java doesnt appear in the Installed JREs list. 
The parameters used do not match a method's signature.Also, underscores may or may not be necessary, so watch out for code that use them when they shouldn't be used or vice versa.
Misspelling a class or method name. Remember that Java is case sensitive and spelling errors are not corrected for you. Trying to use a variable without declaring it.
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