Error in studio pro 9.16.1

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I don’t know what is the error while I want to use many components in microflow it stopped me and pop-up with every letter I wrote in caption or expression   Can anyone help me, Please ?  
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2 answers
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To resolve above issue,

 

Uninstall and ReInstall the Microsoft.NET in your system

answered
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Ahmad, Share as much information with us that you think might be relevant. For starters the information of button ‘Details’.

One suggestion: “Object reference not set to an instance of an object” might point to a missing database-object. Try App->Settings->Doubleclick the configuration->change the dabasename. Though since this error is reported by .Net, this might not solve your problem. Worth a try though.

Second suggestion: upgrade to a higher version, 9.17 or 9.18.

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