I need help on my code javaScript This is my error scrollableView.currentPage is not a function?

Question

thi is my error code

ERROR] TiExceptionHandler: (main) [1347,45778] /ui/common/TabGroupAndr.js:823
[ERROR] TiExceptionHandler:         scrollableView.currentPage(2);
[ERROR] TiExceptionHandler:                        ^
[ERROR] TiExceptionHandler: TypeError: scrollableView.currentPage is not a function
[ERROR] TiExceptionHandler:     at View.<anonymous> (/ui/common/ApplicationTabGroup_Andr.js:823:24)
[ERROR] TiExceptionHandler:     at View.value (ti:/kroll.js:1604:27)
[ERROR] TiExceptionHandler:     at View.value (ti:/kroll.js:1661:27)

Titaniun version 11.1.1