Empty-string error

Please help me. can anyone tell me what is this bug and how can I fix this?


valueIfNotThere should be a create empty list block


Hey, Thankyou. can you explain this. because I’m beginner

sorry, I’m talking about valueIfTagNotThere
you are using an empty text block, which results in that error later in case there are no data in TinyDB…
so the suggestion is to use an create empty list block there same as in the initialization of that variable…
see again the screenshot and the yellow highlighted block

A very good way to learn App Inventor or Kodular is to read the free Inventor’s Manual here in the AI2 free online eBook App Inventor 2 Book: Create Your Own Android Apps … the links are at the bottom of the Web page. The book ‘teaches’ users how to program with AI2 blocks.
There is a free programming course here Course In A Box and the aia files for the projects in the book are here: App Inventor 2 Book: Create Your Own Android Apps
How to do a lot of basic things with App Inventor are described here: How do you...? .

Also do the tutorials Tutorials for MIT App Inventor to learn the basics of App Inventor, then try something and follow the Top 5 Tips: How to learn App Inventor


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