View source for Data feed could not be loaded error message

There can be multiple reasons for "Data feed could not be loaded" message.
#One of the data feeds that is used on your workspaces is disabled in QuoteManager->Tools->Data sources. Make sure that data feeds you are using are Active.
#On one of the charts on your workspace the data feed that is disabled in the QuoteManager is used. Close this chart or activate the data feed for it.
#During MultiCharts installation not all of the data feed DLLs have been installed due to antivirus/firewall activity. Please close MultiCharts and all of its products. Make sure [http://www.multicharts.com/trading-software/index.php/MultiCharts_Processes all processes] are finished. Then go to MultiCharts folder (make a right click on the MultiCharts shortcut –> Properties –> "Shortcut" tab –> select "open file location") and run DataUpdater.exe