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Solved: How do I fix Core Development Mode error occurred while processing your request

Question/Problem Description

In Core the following code inserts bookmarks into a Word document using Syncfusion and then exports the Word doc in the browser. When debugging the project, it works as intended; however, upon publishing the project to Azure, it is no longer function correctly.

The error below is shown on the web page:

An error occurred while processing your request.
Development Mode
Swapping to Development environment will display more detailed information about the error that occurred.
Development environment should not be enabled in deployed applications, as it can result in sensitive information from exceptions being displayed to end users. For local debugging, development can be enabled by setting the ASPNETCORE_ENVIRONMENT environment variable to Development, and restarting the application.

How can I test the code once published on Azure? What procedures should I follow to test the code once it has been published on Azure?


Set the DOTNET_ENVIRONMENT and ASPNETCORE_ENVIRONMENT to Production when you deploy it.


Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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