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I was attempting to use the SFDX CLI to push the following file to a scratch org:

force-app>main>default>messageChannels>SettingCategory_Selected.messageChannel-meta.xml

<?xml version="1.0" encoding="UTF-8" ?>
<LightningMessageChannel xmlns="http://soap.sforce.com/2006/04/metadata">
    <masterLabel>SettingCategorySelected</masterLabel>
    <isExposed>true</isExposed>
    <description>Message Channel to pass a category</description>
    <lightningMessageFields>
        <fieldName>category</fieldName>
        <description>This is the Setup Category that changed</description>
    </lightningMessageFields>
</LightningMessageChannel>

The push failed with the error:

force-app\main\default\messageChannels\SettingCategory_Selected.messageChannel-meta.xml
Error parsing file: The processing instruction target matching "[xX][mM][lL]" is not allowed. (2:6)

Why is it failing to push?

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1 Answer 1

Reset to default
2

A closer look at the XML file makes the problem apparent:

XML file with empty lines before XML starts

There is an empty line / blank space before the XML prolog. Clearing out everything before the <xml version... resolved the somewhat cryptic error message.

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