Unexpected error, please contact system administrator when initially loading app in web browser

Good day

As soon as i load my app into the web browser i get the error “unexpected error, please contact system administrator

Find attached screenshot for insight
help

Hi,
Presented by you information is not enough to diagnoze the cause.
Please investigate contents of tomcat logs: catalina.out (which is shown at the bottom of Studio when the application is launched), app.log.
Usually first exception is the reason of the problem.