Schemachange render: error: argument --vars: invalid loads value: '{variable1: value1, variable2: value2}'

[lgc-jacovanwyk]

For the life of me, I cannot work out how to pass these variables? I run the following: schemachange render -a XXX.eu-west-1 -u XXX -r XXX -w XXX --vars '{"variable1": "value1", "variable2": "value2"}' But repeatedly getting this error back: schemachange render: error: argument --vars: invalid loads value: '{variable1: value1, variable2: value2}'

I've lifted the variables as is from the documentation. Is this a bug?