This error (`SAXParseException: Content is not allowed in prolog`) usually happens for one of two reasons:
1. **Wrong Place:** You are pasting this code into the **Theme > Edit HTML** section (which expects a full XML template). You should be pasting it into a **Page**.
2. **XML Conflict:** Blogger's editor is very strict about "XML" formatting. It hates standard JavaScript symbols like `<` or `>` when they appear inside a script tag, and it requires all tags (like ``) to be closed (like ``).
### **✅ Solution 1: Paste in the Correct Place**
Do **not** paste this in "Theme > Edit HTML". Instead:
1. Go to your Blogger Dashboard.
2. Click **Pages** (on the left menu) > **New Page**.
3. Look for the **pencil icon** or **< >** icon (top left) and switch to **HTML View**.
4. Delete any existing code.
5. Paste the **New Fixed Code** below.
### **✅ Solution 2: Use this "Blogger Safe" Code**
I have modified the code to be **XML-compliant**. I added `//`, ``, etc.) so Blogger won't crash.
**Copy and paste this exact code:**
```html