Error using getappdata when Import excel with multiple sheets

I keep getting an error which I cant seem to solve, all the code is the files, Import_PB imports the excel file.

The error=>

Error using getappdata

Value must be a handle.

Error in Import_PB (line 44)

handles.SheetsData =getappdata(h,'SheetsData');

Answer 1

[Jyotsna Talluri]

The error occurs when the handle 'h' you are refering to is not a valid handle of a handle graphics object .

 handles.SheetsData = getappdata(h,'SheetsData');

Check if you have specified 'Tag' property correctly as findobj is not returning a valid handle

  h = findobj('Tag','GUI_PB');

[Dinouk Goonewardena]

for some reason it does not reconogize the handles from PB_sheet....any idea to fix it?