[From string (line 21) ]
                        
@startuml               
<style>                 
ganttDiagram {          
	task {                 
		FontName Helvetica    
		FontColor red         
		FontSize 18           
		FontStyle bold        
		BackGroundColor blue  
		LineColor yellow      
	}                      
	milestone {            
		FontColor blue        
		FontSize 25           
		FontStyle italic      
		BackGroundColor yellow
		LineColor red         
	}                      
}                       
</style>                
[Task] lasts 20 days    
^^^^^                   
 Syntax Error?