colours in backpack names error?

[456dev]

the conversation
https://cdn.discordapp.com/attachments/745592443269021707/745592474243825774/unknown.png
the error

[11:36:17] [Server thread/WARN]: [FancyBags] Plugin FancyBags v1.6.5 generated an exception whilst handling conversation input
java.lang.IllegalArgumentException: Could not parse ChatColor §cback{
    at net.md_5.bungee.api.ChatColor.of(ChatColor.java:273) ~[Server_spigot-1.16.2.jar:git-Spigot-379750e-9a9c223]
    at me.chickenstyle.backpack.utilsfolder.Utils.color(Utils.java:43) ~[?:?]
    at me.chickenstyle.backpack.prompts.NamePrompt.acceptInput(NamePrompt.java:22) ~[?:?]
    at org.bukkit.conversations.Conversation.acceptInput(Conversation.java:234) ~[Server_spigot-1.16.2.jar:git-Spigot-379750e-9a9c223]
    at org.bukkit.craftbukkit.v1_16_R2.conversations.ConversationTracker.acceptConversationInput(ConversationTracker.java:59) ~[Server_spigot-1.16.2.jar:git-Spigot-379750e-9a9c223]
    at org.bukkit.craftbukkit.v1_16_R2.entity.CraftPlayer.acceptConversationInput(CraftPlayer.java:1241) ~[Server_spigot-1.16.2.jar:git-Spigot-379750e-9a9c223]
    at net.minecraft.server.v1_16_R2.PlayerConnection$2.run(PlayerConnection.java:1551) ~[Server_spigot-1.16.2.jar:git-Spigot-379750e-9a9c223]
    at net.minecraft.server.v1_16_R2.MinecraftServer.b(MinecraftServer.java:1072) ~[Server_spigot-1.16.2.jar:git-Spigot-379750e-9a9c223]
    at net.minecraft.server.v1_16_R2.DedicatedServer.b(DedicatedServer.java:352) ~[Server_spigot-1.16.2.jar:git-Spigot-379750e-9a9c223]
    at net.minecraft.server.v1_16_R2.MinecraftServer.a(MinecraftServer.java:1007) ~[Server_spigot-1.16.2.jar:git-Spigot-379750e-9a9c223]
    at net.minecraft.server.v1_16_R2.MinecraftServer.w(MinecraftServer.java:846) ~[Server_spigot-1.16.2.jar:git-Spigot-379750e-9a9c223]
    at net.minecraft.server.v1_16_R2.MinecraftServer.lambda$0(MinecraftServer.java:164) ~[Server_spigot-1.16.2.jar:git-Spigot-379750e-9a9c223]
    at java.lang.Thread.run(Thread.java:834) [?:?]