UnexpectedError: Error initializing tested program

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Solution: https://stepik.org/submissions/600613/322567004 Feedback:

Unexpected error in test #1

We have recorded this bug and will fix it soon.

Submitted via IDE

OS Windows 10
Java 11.0.8
Vendor JetBrains s.r.o.
Testing library version 7.2

org.hyperskill.hstest.exception.outcomes.UnexpectedError: Error initializing tested program
    at org.hyperskill.hstest.testing.TestedProgram.<init>(TestedProgram.java:110)
    at Test.lambda$generate$0(Test.java:15)
    at org.hyperskill.hstest.testing.runner.AsyncMainMethodRunner.lambda$runMain$0(AsyncMainMethodRunner.java:31)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.ClassNotFoundException: Format of class file incorrect for class calculator.Main : java.lang.ClassFormatError: Extra bytes at the end of class file calculator/Main
    at org.hyperskill.hstest.dynamic.DynamicClassLoader.findClass(DynamicClassLoader.java:60)
    at org.hyperskill.hstest.dynamic.DynamicClassLoader.loadClass(DynamicClassLoader.java:28)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
    at org.hyperskill.hstest.testing.TestedProgram.<init>(TestedProgram.java:105)
    ... 6 more

java.lang.ClassNotFoundException: Format of class file incorrect for class calculator.Main : java.lang.ClassFormatError: Extra bytes at the end of class file calculator/Main
    at org.hyperskill.hstest.dynamic.DynamicClassLoader.findClass(DynamicClassLoader.java:60)
    at org.hyperskill.hstest.dynamic.DynamicClassLoader.loadClass(DynamicClassLoader.java:28)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
    at org.hyperskill.hstest.testing.TestedProgram.<init>(TestedProgram.java:105)
    at Test.lambda$generate$0(Test.java:15)
    at org.hyperskill.hstest.testing.runner.AsyncMainMethodRunner.lambda$runMain$0(AsyncMainMethodRunner.java:31)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)