Visualize_contact_tracing_data : prepare_network: no visible binding
  for global variable ‘id’
Visualize_contact_tracing_data : <anonymous>: no visible binding for
  global variable ‘id’
Undefined global functions or variables:
  id
Visualize_contact_tracing_data : prepare_network: no visible binding
  for global variable ‘id’
Visualize_contact_tracing_data : <anonymous>: no visible binding for
  global variable ‘id’
Undefined global functions or variables:
  id
Visualize_contact_tracing_data : prepare_network: no visible binding
  for global variable ‘id’
Visualize_contact_tracing_data : <anonymous>: no visible binding for
  global variable ‘id’
Undefined global functions or variables:
  id