Ribbon/Xml Problem

Code

<!-- Compiled from "- VBA LIB.XLSM" on 4/20/2015 -->	
	
<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui" >	
    <ribbon>	
        <tabs>	
            <tab id="VBA" label="VBA" insertAfterMso="TabHome" />	
                <group id="CALLS" label="CALLS">	
                    <button id="CALLS_g01b01" label="Build CALLS" onAction="a1__Build_Calls" />
                </group>	
                <group id="SYSTEM" label="SYSTEM">	
                    <button id="SYSTEM_g02b01" label="Compile Ribbon" onAction="vb_Compile_Ribbon_Code" />	
                </group>	
            </tab>	
        </tabs>	
    </ribbon>	
</customUI>

I get the following message:
"The 'tabs' start tag on line 5 does not match the end tag of 'tab'. Line 13, position 15."

It looks balanced to me, and I've used this format lots of times before. I've tried taking out lines, but that doesn't take the mistake away, even if I take everything between the <tabs> tabs.

Don't know if I should post here or under "Non English Excel".

Thanks for any help.
Mac

I thought the lines might have funny coding in them, so here's a check for that:

"Sp,Sp,Sp,Sp,Sp,Sp,Sp,Sp, <,  t, a, b,  s, >
32,32,32,32,32,32,32,32,60,116,97,98,115,62"

and

"Sp,Sp,Sp,Sp,Sp,Sp,Sp,Sp, <, /,  t, a, b,  s, >
32,32,32,32,32,32,32,32,60,47,116,97,98,115,62"

Many thanks, Leith Ross. I messed around and figured this out myself and just returned to mark it "Solved" when I saw your post.

To the formatting of XML is very rigid, and I don't know enough about it yet to figure it out except by comparing what use to work with what isn't working now.

Mac