Java.lang.NoSuchMethodError: java.lang.Float: method parseFloat(Ljava/lang/

java.lang.NoSuchMethodError: java.lang.Float: method parseFloat(Ljava/lang/String;)F not found
WHAT WOULD MAKE THIS HAPPEN. THIS SEEMS TO WORK IN JDK1.3.1 BUT NOT IN BLACKDOWN 1.1.3_V3
THIS IS MY CODE:
try{
DecimalFormat dfp = new DecimalFormat( "0.00" );
if(!Price.equals("")) {
float MyFloat = Float.parseFloat(Price);
Price = dfp.format(MyFloat);
}catch(NumberFormatException nfe){
PriceValid = 1;

This error says:
- There is no method called "parseFloat" that receives a String as parameter in class java.lang.Float.
Look the method "parseFloat" at the class java.lang.Float!!

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