Problem executing the program

while running the program a following pop up is showing up which says error exists and the error is "Must declare a named package because this compilation unit is associated to the named module ‘cruxonline’
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one easy way could be create a new package and create a new class in it and copy your current code and save your code…

other way could be to find module info in project explorer and delete that file

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I wanted to ask whether we can use character/special symbols while naming a variable?