added a line

backgroundROM.sv

@@ -4,6 +4,7 @@ module backgroundROM (  input [9:0] addr,
     
         parameter ADDR_WIDTH = 10;
         parameter DATA_WIDTH = 16;
+        logic [ADDR_WIDTH-1:0] addr_reg;
 
         // Address Width is number of sprites times length of a sprite equal to 2^x. 
         // In this case, 1*8 = 2^x