What is this error and how can I fix it?

Every time I try to find the number in the list I get this error, what is happening?


use Do it to debug your blocks, see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools

Show us a screenshot including Do it results of Codigo_de_Barras.Texto and global Codigo_de_Barras

also next time please switch the language to English before taking a screenshot…


Make sure global codigo variable is a list. How did you obtain values in that variable?

If you are using gsheet then try gviz method