[From string (line 30) ]                                                         
                                                                                 
@startuml                                                                        
title 1.2025.5beta1                                                              
<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 (Assumed diagram type: sequence)