The given key was not present in the dictionary: Plugin

Hi All

I am trying to resoolve this error but no luck.

I want to add prodcuts to the quote but its thrwoing me this error.

Please any help will be good.

Thanks

The Web Service plug-in failed in OrganizationId: 0e345f24-990c-e111-aeef-bc305be3b4de; SdkMessageProcessingStepId: 31154a44-8477-e311-bfd6-00155dcc2d07; EntityName: quotedetail; Stage: 40; MessageName: Create; AssemblyName: Plugins.DiscountingLevelByLine, Plugins, Version=1.0.0.0, Culture=neutral, PublicKeyToken=178b202c3a4f7a38; ClassName: Plugins.DiscountingLevelByLine; Exception: Unhandled Exception: System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.

at System.Collections.Generic.Dictionary`2.get_Item(TKey key)

at SOPPlugins.CheckDiscountingLevelByLine.Microsoft.Xrm.Sdk.IPlugin.Execute(IServiceProvider serviceProvider)

at Microsoft.Crm.Extensibility.V5PluginProxyStep.ExecuteInternal(PipelineExecutionContext context)

at Microsoft.Crm.Extensibility.VersionedPluginProxyStepBase.Execute(PipelineExecutionContext context)

Thanks

Suman