When I tried to update the mod on my server I lost connection when I try to login and I searched at the console and it says this:

[23Nov2019 02:26:16.491] [Server thread/WARN] [net.minecraft.advancements.PlayerAdvancements/]: Ignored advancement 'betterstorage:recipes/reinforced_chest_gold' in progress file ./world/advancements/2d2b3a7d-ed16-3ec7-bc19-ac542411896b.json - it doesn't exist anymore?
[23Nov2019 02:26:16.491] [Server thread/WARN] [net.minecraft.advancements.PlayerAdvancements/]: Ignored advancement 'betterstorage:recipes/reinforced_chest_iron' in progress file ./world/advancements/2d2b3a7d-ed16-3ec7-bc19-ac542411896b.json - it doesn't exist anymore?
[23Nov2019 02:26:16.491] [Server thread/WARN] [net.minecraft.advancements.PlayerAdvancements/]: Ignored advancement 'betterstorage:recipes/reinforced_chest_steel' in progress file ./world/advancements/2d2b3a7d-ed16-3ec7-bc19-ac542411896b.json - it doesn't exist anymore?
[23Nov2019 02:26:16.507] [Server thread/WARN] [net.minecraft.advancements.PlayerAdvancements/]: Ignored advancement 'betterstorage:recipes/reinforced_chest_silver' in progress file ./world/advancements/2d2b3a7d-ed16-3ec7-bc19-ac542411896b.json - it doesn't exist anymore?
[23Nov2019 02:26:16.507] [Server thread/WARN] [net.minecraft.advancements.PlayerAdvancements/]: Ignored advancement 'betterstorage:recipes/reinforced_chest_copper' in progress file ./world/advancements/2d2b3a7d-ed16-3ec7-bc19-ac542411896b.json - it doesn't exist anymore?
[23Nov2019 02:26:16.507] [Server thread/WARN] [net.minecraft.advancements.PlayerAdvancements/]: Ignored advancement 'betterstorage:recipes/reinforced_chest_tin' in progress file ./world/advancements/2d2b3a7d-ed16-3ec7-bc19-ac542411896b.json - it doesn't exist anymore?
[23Nov2019 02:26:16.507] [Server thread/WARN] [net.minecraft.advancements.PlayerAdvancements/]: Ignored advancement 'betterstorage:recipes/reinforced_chest_emerald' in progress file ./world/advancements/2d2b3a7d-ed16-3ec7-bc19-ac542411896b.json - it doesn't exist anymore?
[23Nov2019 02:26:16.507] [Server thread/WARN] [net.minecraft.advancements.PlayerAdvancements/]: Ignored advancement 'betterstorage:recipes/reinforced_chest_zinc' in progress file ./world/advancements/2d2b3a7d-ed16-3ec7-bc19-ac542411896b.json - it doesn't exist anymore?
[23Nov2019 02:26:16.507] [Server thread/WARN] [net.minecraft.advancements.PlayerAdvancements/]: Ignored advancement 'betterstorage:recipes/reinforced_chest_diamond' in progress file ./world/advancements/2d2b3a7d-ed16-3ec7-bc19-ac542411896b.json - it doesn't exist anymore?
[23Nov2019 02:26:17.346] [Server thread/INFO] [net.minecraft.server.management.PlayerList/]: Darkness2796[/187.189.49.39:29086] logged in with entity id 124 at (-135.5, 146.05, 385.5)
[23Nov2019 02:26:17.532] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: Darkness2796 joined the game
[23Nov2019 02:26:17.579] [Netty Epoll Server IO #4/ERROR] [net.minecraft.network.NettyPacketEncoder/]: java.lang.NullPointerException
[23Nov2019 02:26:17.619] [Netty Epoll Server IO #4/ERROR] [net.minecraft.command.arguments.ArgumentTypes/]: Could not serialize net.minecraftforge.server.command.ModIdArgument@77812966 (class net.minecraftforge.server.command.ModIdArgument) - will not be sent to client!
[23Nov2019 02:26:17.620] [Netty Epoll Server IO #4/ERROR] [net.minecraft.command.arguments.ArgumentTypes/]: Could not serialize net.minecraftforge.server.command.EnumArgument@5fb3c7f2 (class net.minecraftforge.server.command.EnumArgument) - will not be sent to client!
[23Nov2019 02:26:17.949] [Server thread/INFO] [Waila/]: Syncing config to Darkness2796 (2d2b3a7d-ed16-3ec7-bc19-ac542411896b)
[23Nov2019 02:26:18.147] [Server thread/INFO] [net.minecraft.network.play.ServerPlayNetHandler/]: Darkness2796 lost connection: Internal Exception: io.netty.handler.codec.EncoderException: java.lang.NullPointerException
[23Nov2019 02:26:18.148] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer/]: Darkness2796 left the game

and erased al the things inside the lockers

Do you have the full error log?

2019-11-23-12.log

This seemed to be a problem with a couple of recipes. I have disabled the effected recipes until I can figure out the cause, but it should now be usable on servers.
As for losing items in lockers, that may have been caused by having updated from a beta version of the mod.