[From string (line 30) ]                        
                                                
@startuml                                       
title 1.2024.5beta1                             
<style>                                         
     {                                          
      actor {                                   
        BackgroundColor  #ffff00                
        FontColor        #00ff00                
        LineColor        #000000                
      }                                         
     .myStyle {                                 
        BackgroundColor #ff0000                 
        FontColor       #00ff00                 
     }                                          
     usecase {                                  
         BackgroundColor #00ff00                
         FontColor       #ffffff                
         LineColor       #0000ff                
     }                                          
     arrow {                                    
         LineColor       #0000FF                
         FontColor       #00FF00                
     }                                          
     .rectangleStyle {                          
         BackgroundColor  #ffff00               
     }                                          
     rectangle {                                
         BackgroundColor  #000000               
     }                                          
}                                               
</style>                                        
^^^^^                                           
 Error in style definition: Invalid open bracket