COMSOL Multiphysics reports problems of two types: errors and warnings.
Errors prevent the program from completing a task. For errors, a COMSOL Error window appears with a brief error description and, in some cases, an
Open Log File button for additional information. Under the node where the error occurred there is, in most cases, also an
Error subnode (
) that contains an error message that generally provides additional information. Also, for many error types, the icon for the node where the error occurred appears with a red cross in the lower-right corner. For some errors there is also a link to more diagnostic information on the COMSOL website.
If an error occurs when you build a node, the build stops. The node with the problem then gets an Error subnode (
) that contains the error message. Also, the node’s icon displays with a red cross in the lower-left corner.
After a successful build of a node, a warning message can sometimes display as a Warning subnode (
). If a warning message exists, the node’s icon displays with an orange triangle in the lower-right corner.
In some cases, you get a Warning node (
) even though meshing completed successfully. This happens, for example, when geometric entities are much smaller that the desired mesh element size, and you should interpreted the warning as a hint that the geometry needs to be simplified to avoid an unnecessarily fine mesh.
A Warnings node (
) can also appear under a
Compile Equations node if some input to the solvers uses inconsistent units, for example.
For things like empty plots, Warnings nodes (
) can appear in the
Results branch during postprocessing. However, you do not get any warnings in these cases: