             return unless key? # wierd error
             return unless key.indexOf(@prefix) is 0
             return if key in useful
-            @del_content(key)
+            @del_content key, (error) =>
+                @logger.error(error) 
             return
         return

                return
            @set_content @make_key(module), module_source, (err, content) =>
                if err?
                    @emit("ModuleDownloadFailed", new DBError(module.url, err), module)
                    return
                module.source = module_source
                module.loaded = module.size

    onUpdateFailed: (event, error)-> 
    onUpdateCompleted: (manifest) -> return true
    onModuleBeginDownload: (module) -> 
    onModuleDownloadFailed: (event, module, error) -> 
    onModuleDownloadProgress: (event, module) -> 
    onTotalDownloadProgress: (progress) -> 
    onModuleDownloaded: (module) -> 
