Error: No plant data at this bus

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Hello! I am trying to insert machines in a bus and im getting this error. Im using the function machinedata2 with the following arguments: psspy.machinedata2(i=601, id=str(i), intgar=[1, 0, 0, 0, 0, 1], \ realar=[300, 80, 9999, -9999, 9999, -9999, \ 100, 0, 1, 0, 0, 1, 1 , 1, 1, 1, 1]) It works only after I manually insert at least one machine at the specified bus, only then im able to insert all the machines i want using this function. I would like to know how to insert the first bus without getting this error. Thanks !