I2C on msp430f5529

Hello! it's been a while!

So i bring more problems. 

I was trying to make a i2c slave with msp430g2553 and a master with msp430f5529. Problem is it wasn't working

Tracked it to be, the code on the msp430f5529 frezes when it reaches wire.Write() command.

Here is the code (i used the //in each command until i knew wich one made the led stop blinking)

#include <Wire.h>


void setup()
{
  // put your setup code here, to run once:
  //P4REN|=BIT2+BIT1;
  pinMode(P1_0,OUTPUT);
  Wire.begin(); 
   digitalWrite(P1_0,LOW);

}

void loop()
{
  digitalWrite(P1_0,HIGH);
  // put your main code here, to run repeatedly:
  Wire.beginTransmission(0x21); // transmit to device #44 (0x2c)                          // device address is specified in datasheet
  Wire.write(1);             // sends value byte  
  Wire.endTransmission();     // stop transmitting
  
  delay(500);
  Wire.beginTransmission(0x21); // transmit to device #44 (0x2c)                          // device address is specified in datasheet
  Wire.write(0);             // sends value byte  
  Wire.endTransmission();     // stop transmitting
  digitalWrite(P1_0,LOW);
  delay(500);



}

Hope anyone can help