R CMD check: Error in get("ptime", pos = "CheckExEnv") ...

Hi,

Does anyboody have insight into what this error terminating "R CMD check" on 
an in-house package may imply?

###
cat("Time elapsed: ", proc.time() - get("ptime", pos = 'CheckExEnv'),"\n")

Error in get("ptime", pos = "CheckExEnv") : 
  unused argument(s) (pos = "CheckExEnv")
Calls: cat -> cat.default -> <Anonymous> -> get
Execution halted

It happens in the "* checking examples ... ERROR" section, yet the example 
code in the file cited as the most likely source works just fine when 
executed manually ...

thanks for any hint. 

Sincerely, Joh