Assign a sales rep to opportunity

I have a custom record set up "Sales Personnel" with custom fields, etc that I call in the script user event script. The script is to search this custom record, count the number of opportunities assigned to each rep and then note with rep should get assigned the next opportunity based on the number of records already assigned to them. I have this deployed to run on opportunity records. Unfortunately, a sales rep is not getting assigned.

Here is the script:

function userEventAfterSubmit(type) {   var arrSearchColumns = new Array();   arrSearchColumns[0] = new nlobjSearchColumn(     'custrecord_ns_accounts_assigned');   arrSearchColumns[0].setSort();   var arrSearchResults = nlapiSearchRecord('customrecord_ns_sales_personnel',     null, null, arrSearchColumns);     var salesPersonId = arrSearchResults[0].getId();   var nextInRotation = nlapiLoadRecord('customrecord_ns_sales_personnel',     salesPersonId);   var employeeId = nextInRotation.getFieldValue('custrecord_ns_sales_person');   var recEmployee = nlapiLoadRecord('employee', employeeId);   var accountsAssigned = nextInRotation     .getFieldValue('custrecord_ns_accounts_assigned');   accountsAssigned = parseInt(accountsAssigned) + 1;   nextInRotation.setFieldValue('custrecord_ns_accounts_assigned',     accountsAssigned);   nlapiSubmitRecord(nextInRotation);   nlapiSetFieldValue('salesrep', employeeId);