Inquiry on sidebar

Happy New Year really loving this platform on a daily basis.i'll be completing my Bsc in IT with speciality in Software Engineering.Mobile computing is one of the course im doing this my final semester(semester-8),and we implementing it using JAVA(Android Studio).Building an app using java is really tough especially for beginners.i was really happy,and still happy when i came accross this platform(MIT App Inventor),that makes complex things very easy.To the point,i got a sidebar somewhere on the internet but it keeps crashing my app.Can someone recommend somewhere i can get a safe one?Thanks guys...

This is one of the best, featureful, and most reliable sidebar extensions I have used:

also related is Ulli's popup menu extension:

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Thanks for the help,but im still getting error...could you please help me with a code snippet of its implimentation,or could i upload my AIA file for help?

Upload your AIA, someone can take a look

COGIC_Hyms.aia (1.9 MB)
Thats my aia file.

You do not appear to have created any sidebar list items?
Revisit Ulli's page and read the documentation of how you can do this.

I also note that you are not switching screens correctly, this can lead to errors and app crashes.

Use different screens wisely

If you decided to use different screens, then you should switch them correctly, else you will run out of memory after a while...      
The recommended method of switching screens in App Inventor
(Thanks Taifun)
Also see demo: multiscreen.aia