Dong Lam Trien

Dong Lam Trien

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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)