[51] Logic contention error on Proteus using GLCD 128x64 with AT89C52

Code C - [expand]
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#include <reg51.h>
 
//Declaring all the control pins
sbit cs1 = P2^0;
sbit cs2 = P2^1;
sbit DI = P2^2;  //In some glcds it is known as rs
sbit RW = P2^3;
sbit E = P2^4;
sbit RST = P2^5;
 
//Declaring variables and functions
unsigned int xcoordinate;
unsigned int ycoordinate;
void Delay(unsigned int itime);
void lcd_initialize();
void lcdcmd(unsigned char bytes);
void lcddata(unsigned char bytes);
void setcursorX(unsigned int position);
void setcursorY(unsigned int position);
void snakemaker(unsigned char *ptrs);
unsigned char initial_snake[15]={0x14, 0x08, 0x3e, 0x08, 0x14,0x14, 0x08, 0x3e, 0x08, 0x14,0x14, 0x08, 0x3e, 0x08, 0x14};
 
void main()
{ 
    
lcd_initialize();
cs1=1;cs2=0;
xcoordinate=0;
ycoordinate=0;  
setcursorX(xcoordinate);
setcursorY(ycoordinate);
snakemaker(initial_snake);
Delay(1000000000);
while(1);
}
//Initializes the LCD
void lcd_initialize()
{
     cs1=0;
   cs2=0;
   RST=1;
     lcdcmd(0x3E);
   lcdcmd(0xB8);
     lcdcmd(0x40);
   lcdcmd(0xc0);    
     lcdcmd(0x3F);
    
}
void lcdcmd(unsigned char bytes)
{
    P1=0x00;
     DI=0;
     RW=0;
     P1=bytes;
     E=1;
     Delay(100);
     E=0;
}
void lcddata(unsigned char bytes)
{
    P1=0x00;
     DI=1;
     RW=0;
     P1=bytes;
     E=1;
     Delay(5);
     E=0;
}
void snakemaker(unsigned char *ptrs)
{
    unsigned int i;
    for(i=0;i<15;i++)
    {
        lcddata(ptrs[i]);
    }
}
void setcursorX(unsigned int position)
{
    lcdcmd(0xB8+position);
}
void setcursorY(unsigned int position)
{
    if(position<64)
    {
        cs1=1;cs2=0;
    lcdcmd(0x40+position);
    }
    else
    {
        cs1=0;cs2=1;
        position=position-63;
        setcursorX(xcoordinate);
        lcdcmd(0x40+position);
    }
    
}
void Delay(unsigned int itime)
{
int i;
    for(i=0;i<itime;i++)
    {
        
    }
}