Getting Errors when Upgrading Enterprise Library from 4.0 to 6.0(namespaces missing )

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.NET

.NET4.5

i am upgrading ms enterprise library from 4.0 to 6.0 in visual studio professional and i Used a namespace Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ObjectBuilder and
also a type ICustomFactory. But once upgraded to EL 6.0, both namespace and types are not available. Please let me know about any alternatives.

Error 1 The type or namespace name 'AssemblerAttribute' could not be found (are you missing a using directive or an assembly reference?)

Error 2 The type or namespace name 'Assembler' could not be found (are you missing a using directive or an assembly reference?)

Error 3 The type or namespace name 'ConfigurationReflectionCache' could not be found (are you missing a using directive or an assembly reference?)

Error 4 The name 'LogFormatterCustomFactory' does not exist in the current context

Error 5 The type or namespace name 'TraceListenerAsssembler' could not be found (are you missing a using directive or an assembly reference?)

Error 6 The name 'InstrumentationProvider' does not exist in the current context