Create a Stack with Heat Orchestration Queens Template Version : Internal Error

I am trying to create a stack from a given .yml template, and in the template i only have the following in the parameter section : parameter : word: {type: json}

When i try to create the stack from the cloud or terminal(in Ubuntu), i get : Internal Error, or The Parameter (word) was not defined in template. I have tried multiple things but nothing works, e.g. i generated a key as shown in the openstack guide : openstack keypair create heat_key > heat_key.priv chmod 600 heat_key.priv

I would be very thankful for every suggestion :) Thanks in advance

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