HTML：错误：开始标记已看到但相同类型的元素已打开

Question

I have this problem when I tried to validate my code:

Error: Start tag a seen but an element of the same type was already open.

I changed the sentence a couple of times but nothing seems to work and frankly I don't understand the error.

Error: Start tag a seen but an element of the same type was already open. From line 134, column 52; to line 134, column 84 e taking: <a href="https://www.drugs.com/">Medica

Here is the part of my code that went wrong

<p>
    Resources: To learn more about diabetes and living with diabetes:
    <a href="http://www.diabetes.org/?referrer=https://www.google.com/">
        American    Diabetes Association><br>
        To learn more about the drugs that you are taking: 
    <a href="https://www.drugs.com/">
        Medications
    </a> 
    <a href="#top">
        Back to top of page
    </a>
</p>

Answer 1

You have three <a> start tags and only two </a> end tags. You need to add the missing end tag.

Answer 2

This part is invalid:

<a        href="http://www.diabetes.org/?referrer=https://www.google.com/">
American    Diabetes Association>

You need to close it like this:

<a        href="http://www.diabetes.org/?referrer=https://www.google.com/">
American    Diabetes Association</a>