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Please help! Having .JAR issues!!

This is a discussion on Please help! Having .JAR issues!! within the Mac Support forums, part of the Tech Support Forum category. I have a Mac- Mini running on OS X Yosemite version 10.10.5 I have never had any issues whatsoever until

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Old 03-26-2017, 04:19 AM   #1
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Join Date: Mar 2017
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OS: OS X Yosemite 10.10.5


I have a Mac- Mini running on OS X Yosemite version 10.10.5
I have never had any issues whatsoever until yesterday. I suddenly cannot open any .Jar files!
When attempting to open Example.jar- I am prompted with:

"The Java JAR file “Example.Launcher.jar” could not be launched. Check the Console for possible error messages.

I proceeded to ensure my Java is up to date (Currently running Java 8) I uninstalled both Java and example.jar several times.

Console Error messages:
Opened Console, cleared the messages to get a fresh and accurate error message:
In my System.log-
Mar 25 10:03:48 Mac-mini-2.local coreduetd[74]: CoreData: error: (1555) UNIQUE constraint failed: ZCDDMSTRINGATTRIBUTE.Z_PK
Mar 25 10:03:48 -Mac-mini-2.local coreduetd[74]: Core Data: error: -executeRequest: encountered exception = error during SQL execution : UNIQUE constraint failed: ZCDDMSTRINGATTRIBUTE.Z_PK with userInfo = {
NSFilePath = "/var/db/CoreDuet/coreduetd.db";
NSSQLiteErrorDomain = 1555;

I then attempted to run my .JAR file via the Terminal and received the following message:
"No such file or directoy"

I am assuming this message from Terminal is due to the inability to open my .JAR for it's initial run- to install.
I have run similar programs in the past, without any issues until yesterday.
Does anyone know what Core Data: Error (1555) is?Why would my Mac suddenly not open a .JAR after working great for months!?
I have been working on this for about 18 hours and I have no idea what else to do.
Please help!

Note- Please be kind and speak to me in layman's terms
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