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Sometimes, the unexpected error is caused by too much data stored on your browser. Let's access your account via a private browser to check if it's a browser-related error or not.
Let me walk you through how.
Once done, try saving and printing your transaction again. If it's working fine, go back to your regular browser and clear your browser's cache.
If you're getting the same result, please contact our Customer Care Support so we can investigate further.
I'm attaching our page about income and expenses in case you need some helpful links for your future task.
Stay in touch if you have questions or concerns, the Community is always here to help. Thanks for posting and happy weekend.