add upgrade handler

app/app.go

@@ -461,8 +461,8 @@ func New(
 
 	app.mm.RegisterInvariants(&app.CrisisKeeper)
 	app.mm.RegisterRoutes(app.Router(), app.QueryRouter(), encodingConfig.Amino)
-	app.mm.RegisterServices(module.NewConfigurator(app.appCodec, app.MsgServiceRouter(), app.GRPCQueryRouter()))
-
+	app.configurator = module.NewConfigurator(app.appCodec, app.MsgServiceRouter(), app.GRPCQueryRouter())
+	app.mm.RegisterServices(app.configurator)
 	// initialize stores
 	app.MountKVStores(keys)
 	app.MountTransientStores(tkeys)
@@ -491,6 +491,9 @@ func New(
 	app.UpgradeKeeper.SetUpgradeHandler(
 		"v2",
 		func(ctx sdk.Context, _ upgradetypes.Plan, fromVM module.VersionMap) (module.VersionMap, error) {
+			app.MarketplaceKeeper.SetParams(ctx, marketplacemoduletypes.DefaultParams())
+			app.MarketplaceKeeper.SetNextAuctionNumber(ctx, 1)
+
 			return app.mm.RunMigrations(ctx, app.configurator, fromVM)
 		},
 	)

x/marketplace/keeper/auction.go

@@ -15,7 +15,7 @@ func (k Keeper) GetNextAuctionNumber(ctx sdk.Context) uint64 {
 
 	bz := store.Get(types.PrefixNextAuctionNumber)
 	if bz == nil {
-		panic(fmt.Errorf("auction module not initialized -- Should have been done in InitGenesis"))
+		panic(fmt.Errorf("%s module not initialized -- Should have been done in InitGenesis", types.ModuleName))
 	} else {
 		val := gogotypes.UInt64Value{}