.I have come up with an InvalidOperationException : the start up form doesn,t load."The error is:Mixed mode assembly is built against version v20.50727 of the runtime and cannot be loaded in the 4 .0 runtime without additional configuration information.

[jeffreykap123]

dear sir,

if you could please tell me what additional information is required and where these options are specified i'd be greatly appreciative of your good advice.

thank you kindly.

i am using VB2010 and Windows 10

[GatorChomp · Accepted solution]

Hi jeffreykap123,

It sounds like you might be using code from an older .NET Framework version in your project while the project is set to use the 4.0 Framework. I'd recommend taking a look at the following articles from Microsoft regarding similar behavior. They should resolve that error message.

https://blogs.msdn.microsoft.com/jomo_fisher/2009/11/17/f-scripting-net-4-0-and-mixed-mode-assemblie...
https://msdn.microsoft.com/en-us/library/bbx34a2h.aspx