SQL Server Valid XML

My following schema works and throws an error if an invalid schema is passed in

So if I use this

<root0MwljpDk4TE</root>

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This error is thrown
Msg 6909, Level 16, State 1, Line 2
XML Validation: Text node is not allowed at this location, the type was defined with element only content or with simple content. Location: /*:root[1]

But I can't seem to get error handling to work.
If I use womething like this I don;t get the @@Error part returned. Just the initial XML Validation error

DECLARE @x XML(videoSchema)
        
SELECT  @x = '<root>0MwljpDk4TE=</root>'

IF @@error <> 0
   PRINT '@err is ' + ltrim(str(@@error)) + '.'

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Heres my schema

CREATE XML SCHEMA COLLECTION videoSchema
    AS'<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="root" >
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="encString" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>'

DECLARE @x XML(videoSchema)
SELECT @x = '<root><encString>0MwljpDk4TE=</encString></root>'

SELECT @x

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