Fixing .NET Error 0x000000cb in Dyalog: “System could not find environment opt”

If you have set DYALOG_NETCORE to 1, but our Dyalog interface to .NET does not work:

First, please see the result of this I-Beam.

2250⌶0

If our Dyalog .NET interface is working, you will get 1 1.

If our .NET interface is not working, you could get the following:

1 0 Could not load bridge interface functions. (Error 0x000000cb: “The system could not find the environment option that was entered.”)

This means that Dyalog could not find the version of .NET that is specified in the Dyalog .NET interface configuration files (Dyalog.Net.Bridge.deps.json Dyalog.Net.Bridge.runtimeconfig.json).

These files are in the Dyalog installation directory.

For instance, Dyalog 18.2 will use .NET Core 3.1 by default, and 19.0 will use .NET 8.0.

You will need administrator privileges to modify these .json files. Please modify them to corresponded to the version of .NET that you have installed.

Please see John Daintree’s post here “How to switch to using .NET 6.0 with 18.2 on Linux” https://forums.dyalog.com/viewtopic.php?f=22&t=1863%20for%20how%20to%20do%20that.

There is more information about the 2250 I-Beam here:
https://help.dyalog.com/latest/index.htm#Language/I%20Beam%20Functions/Verify%20.NET%20Interface.htm