What does this error mean?

[moquan0116]

[jargoman]

I have no idea what you are trying to do but the error seems to be saying min and max ledger do not equal exactly 1. That doesn't make sense. The default values for min and max ledger should be

min = -1
max = -1

or try 

min =-1
max = "current"

Those values represent all the ledgers

 to specify an exact ledger sequence you specify it through min / max

min=2000000
max=3000000