I can't call a RPC in a FlexTable

Hello there,
I have this event in a FlexTable..
flextTable.addClickHandler(new ClickHandler(){
public void onClick(ClickEvent event) {
int cellIndex =
flexTable.getCellForEvent(event).getCellIndex();
int rowIndex =
flexTable.getCellForEvent(event).getRowIndex();

if ((rowIndex==0)||(rowIndex==2)){//se clicco sul
primo risultato...

rpc.setWeb(flexTable.getText(0,0),flexTable.getText(1,0),callback);

.....

(I define rpc in the main class...)

If I launch this method in another part of the code, it work fine.
There is a solution??

Thank for reply and good week,

Sebe

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