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I'm executing a WCF Service and it starts well.

When I try to test the service from WCF Test Client the methods list is showed correctly. WCF Interface

But when I try to executive a method this error message appears.

Error message

I tried to repair Visual Studio, uninstall and reinstall it, delete the ComponentModelCache, but it didn't work. How can I do?

Ascanio Donati
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  • Looks like app may need a different version of the library. Use Solution explorer and delete the existing reference to library. Than add the library which will update the version. – jdweng Jan 20 '22 at 11:14
  • I also tried to remove the library reference but the error remains. Also uninstall and reinstall the library has done nothing, unfortunately. – Ascanio Donati Jan 20 '22 at 11:23
  • Do a clean build. One of the obj intermediate files still contains the reference. – jdweng Jan 20 '22 at 11:44
  • It hasn't worked – Ascanio Donati Jan 20 '22 at 12:34
  • VirtualTreeGrid is a 32 bit dll (not 64). If you are targeting "Any CPU" you are probably defaulting to 64 bit mode. So make sure you are using 32 bit if the library is installed on your machine. The dll is old and is not part of latest Net library release. It probably worked when using older versions of Net before Net 4.5 which used multiple versions of Net (1.0.2.0,3.0,3.5,4.0,4.1,4.2,4.3,4.4). Since now there is one version of Net installed the older obsolete libraries have been removed. – jdweng Jan 20 '22 at 12:55
  • I've tried to target it on the x86 mode, but that way the application won't even start, generation a System.BadImageFormatException – Ascanio Donati Jan 20 '22 at 14:23
  • Did you do a clean build? – jdweng Jan 20 '22 at 14:59
  • You can try running WCFTestClient.exe as a standalone application (no need to install full version of VS).https://stackoverflow.com/questions/6340082/how-can-the-wcf-test-client-be-used-without-visual-studio and https://learn.microsoft.com/en-us/dotnet/framework/wcf/wcf-test-client-wcftestclient-exe#outside-visual-studio – Lan Huang Jan 21 '22 at 05:11

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