Getting Error Passing Multiple Values From List Box

Hi,

I am New To Design Studio Present I am Working On Xcelsius today I got Requirement For Dashboard in  Design Studio i.e I have List Box with Exports And Imports As Lables And Chart Showing Net Values Based on Plant,Requirement Is when Ever we click on Exports we need to Pass Plant 2000 and 3000 and if they click on Imports It should Pass 5000.

For That I have Given Values For Lables

• Exports as 2000,3000
• Imports as 5000

In On select Event I have Written Following Script

DS_1.setFilterExt("0PLANT",LISTBOX_1.getSelectedValues());

But i am Getting Error Cannot Convert From"String array " to "Input String"

Screen Shot Attached For Reference Could you please help on this.