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XML Headers cannot start with numbers, so an error like this means somewhere within the JSON there is a key value that starts with a number, or an invalid character.  In the below JSON, we can see a key that starts with a the number 9. This cannot be converted to XML, so the invalid character(s) need to be removed and replaced. 

"flags_options": {
"9": {
"trusted": true
}
},
"trusted": true

For example, in this case the following replaceAll() expression can be used to remove the replace the key with the text "number"

replaceAll($cleanJSON,'"\\d+":','"number":')

See Regular Expressions

Examples

If we add some xml into a $-variable:

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