UiField cellBrowser with 'provided = true' was null

When running in dev mode I get : 

Caused by: java.lang.AssertionError: UiField cellBrowser with 'provided = true' was null

at com.farheap.jsi.ppmock.client.PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl$Widgets.build_cellBrowser(PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl.java:129)

at com.farheap.jsi.ppmock.client.PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl$Widgets.get_cellBrowser(PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl.java:124)

at com.farheap.jsi.ppmock.client.PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl$Widgets.build_f_HTMLPanel1(PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl.java:99)

at com.farheap.jsi.ppmock.client.PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl$Widgets.get_f_HTMLPanel1(PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl.java:86)

at com.farheap.jsi.ppmock.client.PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl$Widgets.access$0(PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl.java:85)

at com.farheap.jsi.ppmock.client.PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl.createAndBindUi(PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl.java:30)

at com.farheap.jsi.ppmock.client.PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl.createAndBindUi(PrintProviderCellBrowser_PrintProviderCellBrowserUIBinderImpl.java:1)

at com.farheap.jsi.ppmock.client.PrintProviderCellBrowser.<init>(PrintProviderCellBrowser.java:30)

at com.farheap.jsi.ppmock.client.Main.onModuleLoad(Main.java:47)

... 9 more

package com.farheap.jsi.ppmock.client;

import java.beans.Beans;

import java.util.ArrayList;

import java.util.List;

import com.farheap.jsi.ppmock.client.service.PrintProviderMockService;

import com.farheap.jsi.ppmock.client.service.PrintProviderMockServiceAsync;

import com.farheap.jsi.ppmock.shared.pojo.PrintProviderMock;

import com.farheap.jsi.ppmock.shared.pojo.PrintProviderMockError;

import com.google.gwt.core.client.GWT;

import com.google.gwt.uibinder.client.UiBinder;

import com.google.gwt.uibinder.client.UiField;

import com.google.gwt.user.cellview.client.CellBrowser;

import com.google.gwt.user.cellview.client.CellBrowser.Builder;

import com.google.gwt.user.cellview.client.HasKeyboardSelectionPolicy.KeyboardSelectionPolicy;

import com.google.gwt.user.client.rpc.AsyncCallback;

import com.google.gwt.user.client.ui.Composite;

import com.google.gwt.user.client.ui.Widget;

public class PrintProviderCellBrowser extends Composite {

private final PrintProviderMockServiceAsync ppmockService = GWT.create(PrintProviderMockService.class);

private static PrintProviderCellBrowserUIBinder uiBinder = GWT.create(PrintProviderCellBrowserUIBinder.class);

interface PrintProviderCellBrowserUIBinder extends UiBinder<Widget, PrintProviderCellBrowser> {}

@UiField(provided=true)

CellBrowser cellBrowser;

public PrintProviderCellBrowser() throws Exception {

   initWidget(uiBinder.createAndBindUi(this));

   final PrintProviderModel model = new PrintProviderModel();

if (!Beans.isDesignTime() && Main.live) {

ppmockService.getPrintProviders(new AsyncCallback<ArrayList<PrintProviderMock>>() {

@Override

public void onSuccess(ArrayList<PrintProviderMock> result) {

model.setData(result);

}

@Override

public void onFailure(Throwable t) {

t.printStackTrace();

}

});

} else {

PrintProviderMock printProviderMock1 = new PrintProviderMock();

printProviderMock1.setId(1L);

printProviderMock1.setName("Print Provider 1");

PrintProviderMock printProviderMock2 = new PrintProviderMock();

printProviderMock2.setId(2L);

printProviderMock2.setName("Print Provider 2");

PrintProviderMockError error1 = new PrintProviderMockError();

error1.setEnabled(true);

error1.setErrorCode(1);

error1.setId(1L);

error1.setName("Error 1");

PrintProviderMockError error2 = new PrintProviderMockError();

error2.setEnabled(true);

error2.setErrorCode(2);

error2.setId(2L);

error2.setName("Error 2");

PrintProviderMockError error3 = new PrintProviderMockError();

error3.setEnabled(true);

error3.setErrorCode(3);

error3.setId(3L);

error3.setName("Error 3");

printProviderMock1.addPrintProviderMockError(error1);

printProviderMock1.addPrintProviderMockError(error2);

printProviderMock1.addPrintProviderMockError(error3);

printProviderMock2.addPrintProviderMockError(error1);

printProviderMock2.addPrintProviderMockError(error2);

List<PrintProviderMock> list = new ArrayList<PrintProviderMock>();

list.add(printProviderMock1);

list.add(printProviderMock2);

model.setData(list);

}

Builder<PrintProviderMock> builder = new Builder<PrintProviderMock>(model, null);

cellBrowser = builder.build();

cellBrowser.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);

Widget widget = uiBinder.createAndBindUi(this);

initWidget(widget);

}

}

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