w3c validation errors

How can I fix these w3c validation errors for nex gen galleries when I have 2 galleries on the same page?

Line 169, column 62: The first occurrence of ID ngg-image-0 was here.
<div id=”ngg-image-0″ class=”ngg-gallery-slideshow-image” >
Line 411, column 62: Duplicate ID ngg-image-1.
<div id=”ngg-image-1″ class=”ngg-gallery-slideshow-image” >
Line 183, column 62: The first occurrence of ID ngg-image-1 was here.
<div id=”ngg-image-1″ class=”ngg-gallery-slideshow-image” >
Line 425, column 62: Duplicate ID ngg-image-2.
<div id=”ngg-image-2″ class=”ngg-gallery-slideshow-image” >
Line 197, column 62: The first occurrence of ID ngg-image-2 was here.
<div id=”ngg-image-2″ class=”ngg-gallery-slideshow-image” >
Line 439, column 62: Duplicate ID ngg-image-3.
<div id=”ngg-image-3″ class=”ngg-gallery-slideshow-image” >
Line 211, column 62: The first occurrence of ID ngg-image-3 was here.
<div id=”ngg-image-3″ class=”ngg-gallery-slideshow-image” >
Line 453, column 62: Duplicate ID ngg-image-4.
<div id=”ngg-image-4″ class=”ngg-gallery-slideshow-image” >
Line 225, column 62: The first occurrence of ID ngg-image-4 was here.
<div id=”ngg-image-4″ class=”ngg-gallery-slideshow-image” >
Line 467, column 62: Duplicate ID ngg-image-5.
<div id=”ngg-image-5″ class=”ngg-gallery-slideshow-image” >
Line 239, column 62: The first occurrence of ID ngg-image-5 was here.
<div id=”ngg-image-5″ class=”ngg-gallery-slideshow-image” >

https://wordpress.org/plugins/nextgen-gallery/