c# - Cannot Place User Control on Form -

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i've created c# winforms application using vs2010. i'm new creating user controls created new user control (as part of same project).

when rebuild project, new control appears in toolbox. , when drag control toolbox onto form, following error.

failed load toolbox item 'taggroup'. removed toolbox.

this happened other time created user control well. i've searched web answers found seemed related having control in separate assembly. (note found plenty of questions same problem i'm having.)

can suggest should next?

i figured 1 out.

the project i'm working uses 2 class-library assemblies. although these have nothing control i'm discussing, looked , saw both libraries have platform target in properties|build tab set "any cpu".

on other hand, application had setting set "x64". changing application's setting "any cpu", can place user controls onto forms.

go figure...


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