c# - dnx . ef command returns System.Reflection.ReflectionTypeLoadException -


i'm trying create first migration file , got following error after execute dnx command:

dnx . ef migration add migrationfile

system.reflection.reflectiontypeloadexception: unable load 1 or more of  requested types. retrieve loaderexceptions property more information.    @ system.reflection.runtimemodule.gettypes(runtimemodule module)    @ system.reflection.assembly.gettypes()    @ microsoft.data.entity.commands.contexttool.getcontexttypes(assembly assembly)    @ microsoft.data.entity.commands.migrationtool.getcontexttypes()    @ microsoft.data.entity.commands.migrationtool.getcontexttype(string name)    @ microsoft.data.entity.commands.migrationtool.addmigration(string migration name, string contexttypename, string startupassemblyname, string rootnamespace, string projectdir)    @ microsoft.data.entity.commands.program.<>c__displayclass12_0.<addmigration>b__0()    @ microsoft.data.entity.commands.program.execute(string startupproject, func`1 invoke)    @ microsoft.framework.runtime.common.commandline.commandlineapplication.execute(string[] args) --- end of stack trace previous location exception thrown ---     @ system.runtime.exceptionservices.exceptiondispatchinfo.throw()    @ microsoft.framework.runtime.common.entrypointexecutor.execute(assembly assembly, string[] args, iserviceprovider serviceprovider)    @ microsoft.framework.applicationhost.program.executemain(defaulthost host, string applicationname, string[] args)    @ microsoft.framework.applicationhost.program.main(string[] args) --- end of stack trace previous location exception thrown ---     @ system.runtime.exceptionservices.exceptiondispatchinfo.throw()    @ microsoft.framework.runtime.common.entrypointexecutor.execute(assembly assembly, string[] args, iserviceprovider serviceprovider)    @ dnx.host.bootstrapper.runasync(list`1 args, iruntimeenvironment env, frame workname targetframework)    @ dnx.host.runtimebootstrapper.executeasync(string[] args, frameworkname targetframework)    @ dnx.host.runtimebootstrapper.execute(string[] args, frameworkname targetframework) 


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