How we will Debug Application ?
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What do you mean by debugging an application? We can help better if you provide more details
codeblog.jonskeet.uk/.../
how to Debug Our Entire Application
Is there any specific issue you want to solve?
Debugging in general would require testing all your flows with each and every scenario and then locate the errors and fix them. Typically errors messages in Appian are descriptive and have details about cause and solution of the error, read those messages carefully and try to fix them.