Why is JavaScript runtime error when running in design mode?

Feb 14 2020 2:35 AM

In VS2010 design mode when I press F5 to run the program, I get the following error:

1. JavaScrip runtime error: Unable to set property 'showmessagebox' of undefined or null reference.

2. JavaScrip runtime error: Unable to set property 'evaluationfunction' of undefined or null reference.

When this error I have to press Continue will continue to run, how to fix it ? You see my attached photo file.

https://imgur.com/50sExkp

https://imgur.com/11T0RiN

Answers (4)