in my cabal repl, i'm getting the following error from trying to replicate the week1 demo of Plutus-pioneer-program. I'm also unable to simulate the example scenario in the playground (i can see genesis transaction, but none of the subsequent bids), but I'm hoping the issue lies here:

Prelude Ledger.TimeSlot Week01.EnglishAuction> slotToEndPOSIXTime 10

<interactive>:10:20: error:
    • No instance for (Num SlotConfig) arising from the literal ‘10’
    • In the first argument of ‘slotToEndPOSIXTime’, namely ‘10’
      In the expression: slotToEndPOSIXTime 10
      In an equation for ‘it’: it = slotToEndPOSIXTime 10
Prelude Ledger.TimeSlot Week01.EnglishAuction> 

1 Answer 1


That error occurs because your code has a number literal (ie 10) in a code position where a value of type SlotCOnfig is expected and the the compiler can't figure out how to convert the literal to a SlotConfig (ie "No instance for (Num SlotConfig)").

I would need to see more of the code (possibly all of it) to figure out a solution.

Ah, so the type of slotToEndPOSIXTime is:

slotToEndPOSIXTime :: SlotConfig -> Slot -> POSIXTime

Getting a correct SlotConfig value is going to be tricky, but the good news is that Slot does have a Num instance, so the literal 10 is a valid slot.

  • I'm not sure what other context to provide. The complete one-line command was simply that: slotToEndPOSIXTime 10
    – tyvan266
    Dec 15, 2022 at 0:19
  • Five lines, the like to error occurs on and two lines before and after. Also what is the type of the function slotToEndPOSIXTime ? Dec 15, 2022 at 0:57
  • I expanded the answer I gave above. Basically the problem is that you can calling the slotToEndPOSIXTime with one parameter (10) when it really needs two parameters; a SlotConfig type and then the 10 that you are currently giving it. Dec 15, 2022 at 4:17

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