I'm trying to compile the formula but it's giving synatx error, what could be wrong.

/***********************************************
Name: TAX_PAY_CALC
Type: Element Input Validation
Description: Income Tax calculation inclusive of all taxable income excluding the tax reliefs
***********************************************/

Default for SALARY_OA_AMOUNT_ASG_ENTRY_VALUE is 0

Inputs are Pay_Value

l_effective = GET_CONTEXT(EFFECTIVE_DATE, '1990/01/01'(date))
l_dateEarn = GET_CONTEXT(DATE_EARNED, '1990/01/01'(date))
CHANGE_CONTEXTS(DATE_EARNED = l_effective)

/* Calculate the total monthly income */
Annual_Salary = SALARY_OA_AMOUNT_ASG_ENTRY_VALUE * 12
Manager_Driver_Allowance = MANAGER_DRIVERS_ALLOWANCE_PAY_VALUE_ASG_ENTRY_VALUE * 12
GM_Gardner = GM_GARDENERS_ALLOWANCE_PAY_VALUE_ASG_ENTRY_VALUE * 12
Generator_Cash_in_lieu = GENERATOR_CASH_IN_LIEU_PAY_VALUE_ASG_ENTRY_VALUE / 4