Object not found error in R function during importing from excel

Solution 1:

  LCA.matrix <- c(LCA.matrix | 
    mutate(TotalMaterials.Q = quantities * bridge.Q / 1000) |
    mutate(materials.LC = TotalMaterials.Q * interventions) |
    mutate(Energy.LC = materials.LC*energy) |
    mutate(CO2.LC = materials.LC*CO2*1000) |
    mutate(NOx.LC = materials.LC*NOx*1000) |
    mutate(SO2.LC = materials.LC*SO2*1000))
  

Thanks for the idea, I deleted the previous one and tried to add this.But still bridge.Q can not be found. I could not understand the problem.