else without a previous if

Plsw help It says Else with a Previous if

int TasAns=10;
int KnoAns=9;
int KnoAuf=8;
int VentDown=7;
int VentUp=6;
int ZylAnsL=5;
int ZylAnsR=4;
int tasterstatusTasAns=0;
int tasterstatusKnoAns=0;
int tasterstatusKnoAuf=0;

void setup() {
pinMode(TasAns, INPUT);
pinMode(KnoAns, INPUT);
pinMode(KnoAuf, INPUT);
pinMode(VentDown, OUTPUT);
pinMode(VentUp, OUTPUT);
pinMode(ZylAnsL, OUTPUT);
pinMode(ZylAnsR, OUTPUT);
}

void loop()
{
tasterstatusKnoAuf=digitalRead(KnoAuf);
if (tasterstatusKnoAuf == HIGH);
{
digitalWrite(VentUp, HIGH);
delay(5000);
digitalWrite(VentUp, LOW);
}
else
{
digitalWrite(Ventup, LOW);
}
}

(deleted)

void loop()
{
  tasterstatusKnoAuf = digitalRead(KnoAuf);
  if (tasterstatusKnoAuf == HIGH)
  {
    digitalWrite(VentUp, HIGH);
    delay(5000);
    digitalWrite(VentUp, LOW);
  }
  else
  {
    digitalWrite(Ventup, LOW);
  }
}

This should be written much more simply:

void loop()
{
  tasterstatusKnoAuf = digitalRead(KnoAuf);
  if (tasterstatusKnoAuf == HIGH)
  {
    digitalWrite(VentUp, HIGH);
    delay(5000);
  }
  digitalWrite(VentUp, LOW);
}

and use ctrl-T to auto format the code…