Bukkit

What version of DynamicEconomy are you using?:

Try to explain how to arrive at the problem:
1) a command like /dynecon ?
2) or /dynamiceconomy sell ?
3)

Please paste the error log, if any. (Also provide DynamicEconomy log)
2012-07-12 09:43:45 [WARNING] Task of 'DynamicEconomy' generated an exception
java.lang.NumberFormatException: For input string: "?"
    at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
    at java.lang.Double.parseDouble(Unknown Source)
    at me.ksafin.DynamicEconomy.EnderEngine.<init>(EnderEngine.java:37)
    at me.ksafin.DynamicEconomy.Transaction.run(Transaction.java:1912)
    at com.bergerkiller.bukkit.nolagg.examine.TimedWrapper.run(TimedWrapper.java:20)
    at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:126)
    at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:533)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Here is the sell error:

2012-07-12 09:58:47 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'sell' in plugin DynamicEconomy v.9.2
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)
    at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:479)
    at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:821)
    at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:781)
    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:764)
    at net.minecraft.serverhook.NetServerHandlerProxy.a(NetServerHandlerProxy.java:141)
    at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:34)
    at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
    at net.minecraft.serverhook.NetServerHandlerProxy.a(NetServerHandlerProxy.java:83)
    at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
    at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.NumberFormatException: For input string: "?"
    at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
    at java.lang.Double.parseDouble(Unknown Source)
    at me.ksafin.DynamicEconomy.Transaction.sell(Transaction.java:691)
    at me.ksafin.DynamicEconomy.DynamicEconomyCommandExecutor.onCommand(DynamicEconomyCommandExecutor.java:292)
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
    ... 14 more

oops... the error comes up when /sell nothing

But it would also come up with the other command i typed in because it seems that any unknown command will throw an error.

Caused by: java.lang.NumberFormatException For input string: "?"

Fail in .yml file ?????

Yes. There was a few strange items in the items.yml that i fixed and it seems to be ok now. Thanks for the help.