Rudder

I tried to create a technique using a wrong syntax using the node properties:
${node.properties.key[subkey]} instead of ${node.properties[key][subkey]}

Current error message is :

Could not update ncf technique <- Error when translating parameter '${node.properties.[key][subkey]}' of technique of method BundleName(command_execution) of technique test <- Error when parsing value "${node.properties.[key][subkey]}", error message is: end of input expected

It could explain that it parsed a node property and what is the correct syntax