c# - No matching constructor found on type. You can use the Arguments or FactoryMethod directives to construct the type -

i'm hoping can me odd issue. developing wpf .net framework 4.0 application, receiving message:

no matching constructor found on type. can use arguments or factorymethod directives construct type when attempting use following code.

usercontrol:

<grid>                         <groupbox header="diagram">         <scrollviewer horizontalscrollbarvisibility="auto" verticalscrollbarvisibility="auto">             <designer:designercanvas focusable="true" x:name="mydesigner"                 background="{staticresource windowbackgroundbrush}" margin="10"                 focusvisualstyle="{x:null}"                 contextmenu="{staticresource designercanvascontextmenu}" />         </scrollviewer>     </groupbox> </grid> 

class:

/// <summary> /// designer canvas. /// </summary> public partial class designercanvas : canvas {     public designercanvas()     {       ....     } } 

as far can see there doesn't appear wrong code.

thanks, john

update:

turns out masking underlying exception. stripped out in constructor in designercanvas , worked. re-added setting command bindings in separate method , received:

system.missingmethodexception: method not found: void system.windows.input.commandbinding..ctor(system.windows.input.icommand, system.windows.input.executedroutedeventhandler)

the constructor included attempts setup command bindings. e.g.

public void setupcommanddefaults()     {         this.commandbindings.add(new commandbinding(applicationcommands.new, this.new_executed));     } 

i'm uninstalling , reinstalling .net framework 4.0 in faint hope fix problem.

turns out after pain re-installing .net framework 4, applying various kb patches , including runtime 4.0.3. problem caused ilmerge msbuild step.

the build process included msbuild task after build merge main executable dll's.

i removed ilmerge step , error disappeared.

not sure why occured on environment , not on of our test machines working now.