Hi Kaja,
I hope you have installed required JAB and enabled it,if not this link will help you.
https://portal.blueprism.com/system/files/2017-11/v6%20User%20Guide%20-%20Java%20Access%20Bridge.pdfselect "External, 64 bit mode" from application manager mode drop down ( you can get it in application modeller wizard ) save it and check.
Hope it will resolve your issue.
Thanks
Nilesh
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Nilesh Jadhav
Senior RPA Specialist
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Nilesh Jadhav.
Consultant
ADP,India