Error with running JAR files created with NetBeans

I have been having difficulty running the JAR files that NetBeans compiles. When I run my code from NetBeans, it always works just fine, but when I try to run the compiled JAR I get the following errors:
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass2(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:719)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:160)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:254)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
This is happening for multiple projects now, though I don't remember it happening before. What am I doing wrong? Why is this happening? How can I fix it? Thank you for any insights...

Oh, I forgot to mention, all the NetBeans samples work, just not apps that I create. This is very frustrating!

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I have a file created by Trial version of captivate. It was created in a different computer. Now, I have to make some modification in the file. However, when I tried to open it with Captivate 5.5, I got the error shown below. I am not able to use the popular solution provided in this link Click here to view because the file was not created in my computer. I believe that there is a lock on the file since it was created with Trial version of captivate. Is it possible that I send the file to a representative, and they look into it?

Was the file created with the same version? You talk about 'trial', but the only trial version available at this moment is Captivate 8. You were never able to open a Captivate project in a previous version, that explains why you cannot open it in 5.5.

File created with Trial version cannot be opened by Captivate 5.5 (Ensure that the file isn't open, the file isn't damaged....etc.)

Hi,
I have a file created by Trial version of captivate. It was created in a different computer. Now, I have to make some modification in the file. However, when I tried to open it with Captivate 5.5, I got the error shown below. I am not able to use the popular solution provided in this link Click here to view because the file was not created in my computer. I believe that there is a lock on the file since it was created with Trial version of captivate. Is it possible that I send the file to a representative, and they look into it?

Was the file created with the same version? You talk about 'trial', but the only trial version available at this moment is Captivate 8. You were never able to open a Captivate project in a previous version, that explains why you cannot open it in 5.5.

Error with running JAR files created with NetBeans

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