Quick Answer

Fix unbalanced parentheses in functions.

Understanding the Issue

This syntax error occurs when parentheses are mismatched in function definitions or calls.

The Problem

This code demonstrates the issue:

Javascript Error 
function sum(a, b {
    return a + b;
}

The Solution

Here's the corrected code:

Javascript Fixed 
// Corrected syntax:
function sum(a, b) {
    return a + b;
}

// Proper function call:
console.log("Hello");

// Arrow functions:
const add = (a, b) => a + b;

Key Takeaways

Always balance parentheses in function definitions and calls.