Argument of number

Argument of type 'number' is not assignable to parameter of type 'string'

,vv,{headers:headers})
    .subscribe(data => {
      this.sew =parseInt(data.bol);
this.totalLikes=this.sew    });

Anyone this answer, its buggin me cuz it works to brute force the parsint but it gives an error
sew is a number and data.bol is just a string according to ide