I'm getting this error: Error: Compile Error: Method does not exist or incorrect signature: Commission1(Double, Double, Double, Double) at line 27 column 37.

<apex:page controller="CommishController"> <apex:form > <apex:pageBlock title="Inputs"> <p><b>Report for {!$User.FirstName} {!$User.LastName}</b></p> <br /> <b>Quota </b> <apex:inputText value="{!Quota}" /> <br /> <b>Variable Salary </b> <apex:inputText value="{!Variable_Salary}" /> <br /><br /> <apex:commandButton action="{!genMyList}" value="Calculate" rerender="MyOpps" status="status"/> <br /> <apex:pageMessages ></apex:pageMessages> </apex:pageBlock> <apex:actionStatus startText="Updating..." id="status"/> <apex:pageBlock title="MyOpps" id="MyOpps" > <apex:dataTable value="{!MyList}" var="aOpp" width="100%"> <apex:column > <apex:facet name="header"><b>AccountId</b></apex:facet> {!aOpp.myopp.Id} </apex:column> <apex:column > <apex:facet name="header"><b>Name</b></apex:facet> {!aOpp.myopp.Name} </apex:column> <apex:column > <apex:facet name="header"><b>Amount</b></apex:facet> {!aOpp.myopp.Amount} </apex:column> <apex:column > <apex:facet name="header"><b>Commission</b></apex:facet> {!aOpp.Commission_Amount} </apex:column> </apex:dataTable> </apex:pageBlock> </apex:form> </apex:page>

public class CommishController { public PageReference genMyList() { MyList = bMyList(); return null; } public Double Quota {get; set;} public Double Variable_Salary {get; set;} /* New wrapper class */ public class cOpportunity{ public Opportunity myopp {get; set;} public Double Commission_Amount{get; set;} /*This is the constructor method. When we create a new cCommission object we pass a SCRB_Salesorder_c that is set to the corder property. We also set the Commission_Amount value to zero*/ public cOpportunity(Opportunity o,Double Q,Double VS){ myopp = o; if(!(o.Amount==null)){ Double Rate = 0; If (Q > 0) { Rate = VS/Q; } Double myAmount = o.Amount * 1.0; //public Double Commission1(double rev_start, double rev_new, double quota, double rate) { Commission_Amount = Commission1(0.0, myAmount, Q, Rate); }else{ Commission_Amount = 0; } } } //A collection of the class/wrapper objects cOpportunity public List<cOpportunity> MyList {get; set;} //This method uses a SOQL query to return a List of Opportunities public List<cOpportunity> bMyList(){ if(MyList == null){ MyList = new List<cOpportunity>(); for(Opportunity opp : [Select Id, Name, Amount FROM Opportunity ]){ /* As each opportunity is processed I create a new cOpportunity object and add it to MyList */ MyList.add(new cOpportunity(opp,Quota,Variable_Salary)); } } return MyList; } /* This method calculates commission */ public Double Commission1(double rev_start, double rev_new, double quota, double rate) { // Calculates Commission according to the structure below // If the code looks VBA-like, that's because I originally wrote it // as a VBA user defined function back in 2006 // Less than or equal to 100%, 1.0x (calculated based on quota) // Greater than 100% to 150%, 1.5x calculated rate // Greater than 150%, 2.0x calculated rate // Inputs are // REV_START = Revenue at Period Start // REV_NEW = Revenue for the Period // QUOTA = Annual Quota // RATE = Commission Rate Double rev_total; Double c; Double a; Double q150; Double q25; Double myCommish = 0.0; rev_total = rev_start + rev_new; c = rev_total; a = rev_start; q150 = 1.50 * quota; q25 = 0.25 * quota; If (a > q150) { myCommish = 2 * RATE * REV_NEW; } Else { If (A > QUOTA) { If (C > Q150) { myCommish = RATE * ((2 * (C - Q150)) + (1.5 *(Q150 - A))); } Else { myCommish = RATE * 1.5 * (C - A); } } Else { If (C > Q150) { myCommish = RATE * ((2 * (C - Q150)) + (1.5 * Q25 + (QUOTA - A))); } Else { If (C > QUOTA) { myCommish = RATE * ((1.5 * (C - QUOTA)) + (QUOTA - A)); } Else { myCommish = RATE * (C - A); } } } } return myCommish; } }