Behobene Fehler und umgesetzte Ideen » Ich kann nichts mehr ernten?

Uncaught TypeError: undefined is not a function   ProductionControls.js?v=1.7.1:399
 SelectFieldControl.calcNextCost                   ProductionControls.js?v=1.7.1:399
 SelectFieldControl.updateCost                     ProductionControls.js?v=1.7.1:377
 SelectFieldControl.show                           ProductionControls.js?v=1.7.1:317
 LandMapController.startSelectField                LandMapController.js?v=1.7.1:143 
 ProductionWorkerSelector.startSelectingFields     BuildingPopups.js?v=1.7.1:212
 onclick                                           game:1