Slitherine

hello, i need help with commendation points trigger for my custom campaign, i've created the scripts following the AO lua files, but when i start my campaign i get the following error message 90: bad argument #2 to 'format' (number expected,got nil)
here are the scripts

• current_cp_format = NSLOCTEXT("scenario_Poznan", "current_cp_format", "In this campaign, you can earn Commendation Points by completing bonus objectives. Opportunities to exchange Commendation Points for various rewards will be offered as the campaign progresses.\n\nYou begin this campaign with %d Commendation Points.")
  earned_cp_format2 = NSLOCTEXT("scenario_Poznan", "earned_cp_format2", "Secondary Objective to Destroy all Polish Aircraft completed.\nEarned Commendation Points: %d.\nTotal Commendation Points: %d.")
  earned_cp_format = NSLOCTEXT("scenario_Poznan", "earned_cp_format", "Secondary Objective to capture all Polish Aifields completed.\nEarned Commendation Points: %d.\nTotal Commendation Points: %d.")
  
  function AlwaysTrue()
  return true
  end
  
  function OnStartGame()
  local str = string.format(tostring(current_cp_format), campaign.comm_points) --here is where the error triggers
  MessageBox(str)
  end
  
  function OnObjective2(action)
  local comm = 0
  
  comm = 1
  
  campaign.comm_points = campaign.comm_points + comm
  
  local str2 = string.format(tostring(earned_cp_format2), comm, campaign.comm_points)
  MessageBox(str2)
  -- end
  end
  
  function Objective2Condition(action)
  return action.side == 0 and action.objective == 2 and action.status == ObjectiveStatus.Success
  end
  
  function OnObjective1(action)
  local comm = 0
  
  comm = 1
  
  campaign.comm_points = campaign.comm_points + comm
  
  local str1 = string.format(tostring(earned_cp_format), comm, campaign.comm_points)
  MessageBox(str1)
  -- end
  end
  
  function Objective1Condition(action)
  return action.side == 0 and action.objective == 1 and action.status == ObjectiveStatus.Success
  end

for extra information i will attach the lua file of the script

Cross scenario global variables need to be initialized in the script.lua of the campaign itself, where the scenario tree is configured.

campaign.comm_points = 0

thank you kerensky!