GWT using SDM throws error at app startup

I'm getting the following error after SDM compiles my app and trying to load it. What's causing this? Seems the compiler is generating invalid JS?  How can I resolve this?  I can't debug my app anymore.


SEVERE: (TypeError) __gwt$exception: <skipped>: Cannot read property 'view' of undefined com.google.gwt.core.client.JavaScriptException: (TypeError) __gwt$exception: <skipped>: Cannot read property 'view' of undefined: at 

Unknown.$getView(adloader-0.js@21:31671) 

Unknown.setBookingSheetRowData_0(adloader-0.js@16:104761) 

Unknown.gridRowsChanged_1(adloader-0.js@17:104543) 

Unknown.updateGridRowsWithChildrenAdded(adloader-0.js@14:104468) 

Unknown.$addChildModelRows(adloader-0.js@39:103808) 

Unknown.LoadAdsPrepareModel_0(adloader-0.js@3:103898) 

Unknown.$onModuleLoadImpl(adloader-0.js@25:89933) 

Unknown.$onModuleLoad_2(adloader-0.js@5:89837) 

Unknown.init_1(adloader-0.js@19:17385) 

Unknown.apply_9(adloader-0.js@23:7805) 

Unknown.entry0(adloader-0.js@14:7895) 

Unknown.anonymous(adloader-0.js@16:7855) 

Unknown.gwtOnLoad(adloader-0.js@19:118446) 

Unknown.anonymous(adloader-0.js@167:118452)

I'm using GWT 2.6.1

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