Error of unsaved file

Hi Team,

I'm developing an internal extension for my company. The extension allow user to open psd document inside it. But I'm facing an weird adnormal case. When user create a new PSD document and doens't save it, then continue to open an existing document from my extension. Following error message is shown up.

"The document has not yet been saved."

Currently, I'm using app.open() function to open an existing document with known file path. Any idea how I can overcome above incident?

Thanks for reading my question,

P/S: I suddenly realize that I posted this on wrong room. But if you have idea, just let me know. Thanks