Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘PartialNetwork-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: sim.IV
  > ### Title: Instrument Variables for SAR model
  > ### Aliases: sim.IV
  > 
  > ### ** Examples
  > 
  > library(AER)
  Error in library(AER) : there is no package called ‘AER’
  Execution halted