Hi there,

I am writing the master page for a web site I am supposed to publish soon, and I am having issues image and video errors. If someone could please help me understand what I am supposed to do, I would appreciate. Here are the errors that I get.

Code:
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    The validator checked your document with an experimental feature: HTML5 Conformance Checker. This feature has been made available for your convenience, but be aware that it may be unreliable, or not perfectly up to date with the latest development of some cutting-edge technologies. If you find any issues with this feature, please report them. Thank you.

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Validation Output: 6 Errors

    Error Line 47, Column 27: Bad value assets/images/kyoto protocol white.jpg for attribute src on element img: Whitespace in path component. Use %20 in place of spaces.

          alt="Kyoto Protocol"></div>

    Syntax of IRI reference:
        Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20. 

    Error Line 49, Column 40: Bad value assets/images/kyoto protocol white resized.jpg for attribute src on element img: Whitespace in path component. Use %20 in place of spaces.

          height="210" alt="Kyoto Protocol"></div>

    Syntax of IRI reference:
        Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20. 

    Error Line 131, Column 20: Duplicate ID box.

          <div id="box"> "the average global temperature on Earth has increased by …

    ✉
    Warning Line 114, Column 20: The first occurrence of ID box was here.

          <div id="box"> "In the centre was also the question of how to relieve the…

    ✉
    Error Line 148, Column 78: Bad value assets/videos/1880-2011 temp anomaly.mp4 for attribute src on element source: Whitespace in path component. Use %20 in place of spaces.

          <source src="assets/videos/1880-2011 temp anomaly.mp4" type="video/mp4">

    Syntax of IRI reference:
        Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20. 

    Error Line 149, Column 77: Bad value assets/videos/1880-2011 temp anomaly.mov for attribute src on element source: Whitespace in path component. Use %20 in place of spaces.

          <source src="assets/videos/1880-2011 temp anomaly.mov" type="vide/ogg">

    Syntax of IRI reference:
        Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20. 

    Error Line 150, Column 63: Bad value assets/videos/20 sec 5 year mean 1881-2007.mov for attribute href on element a: Whitespace in path component. Use %20 in place of spaces.

    …="assets/videos/20 sec 5 year mean 1881-2007.mov">10 Year MeanAnomaly 1881-2007

    Syntax of IRI reference:
        Any URL. For example: /hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.
Is there some way that I can fix these issues? Does anyone know how to set spaces to escape 20%? I am actually contemplating getting rid of the images and of the video.