The network analysis layer or the network dataset uses one or more network attributes whose values are assigned by a script evaluator that uses VBScript. VBScript isn't supported by ArcGIS for Server (Linux) or ArcGIS Runtime for Linux.
If you are sharing your network dataset as a service or a package on one of these two platforms, you will need to follow one of the solutions below. If you are sharing it on a Windows platform, you can ignore this message.
Solutions
Take any one of the following actions to resolve this issue:
See if you can replace the script evaluator with another type of evaluator. By doing this, you will not only resolve this error, you will also reduce the time it takes to solve a network analysis. Script evaluators are dynamic and are evaluated when a network analysis is solved, whereas, most other types of evaluators are evaluated beforehand, that is, during the network build process. (Function evaluators are also evaluated during the solve process, but they evaluate much faster than script evaluators.)
Delete the script evaluator's VBScript and rewrite it in Python.
Delete the network attribute, but only if it's not required.
More information
You can access a network dataset's evaluators by opening the Network Dataset Properties dialog box, clicking the Attributes tab, clicking a network attribute, then clicking Evaluators.