I am having this error on my project, but when I tested it to my other project there is no problem
Select list item: Attempt to get item number 0, of the list [com.google.appinventor.components.runtime.Button@546b782, com.google.appinventor.components.runtime.Button@ba69d0b, com.google.appinventor.components.runtime.Button@b91ee93, com.google.appinventor.components.runtime.Button@b415ec9, com.google.appinventor.components.runtime.Button@1e2e0ef, com.google.appinventor.components.runtime.Button@a781e85]. The minimum valid item number is 1.
