java.lang.Error: Unresolved compilation problems: r1 cannot be resolved to a variable r1 cannot be resolved r1 cannot be resolved to a variable

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Unresolved compilation problems: r1 cannot be resolved to a variable r1 cannot be resolved r1 cannot be resolved to a variable
java.lang.Error: Unresolved compilation problems: r1 cannot be resolved to a variable r1 cannot be resolved r1 cannot be resolved to a variable
at toStack.Stack.foo(Stack.java:18)
at toStack.Stack.main(Stack.java:13)

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