All Solutions

Undefined Function Call

Solution Number: 1187 Applies to: COMSOL Multiphysics Versions: All versions

The error "Undefined function call" occurs. An expression in the model contains an undefined function name. Check that the function name is correct and that the function is in the COMSOL Multiphysics or MATLAB® path.


Internal evaluation error: unexpected NaN encountered

Solution Number: 1188 Applies to: COMSOL Multiphysics Versions: All versions

The error "Internal evaluation error: unexpected NaN encountered" occurs. This error occurs when Not-a-Number (NaN) values appear unexpectedly. Such values can be the result of floating-point operations such as 0/0, ...


Unsupported Integration Order

Solution Number: 1189 Applies to: COMSOL Multiphysics Versions: All versions

The error "Unsupported integration order" occurs. The integration order for the numerical quadrature is too high. For triangular elements the order can be up to 10, and for tetrahedral elements the order can be up to ...


Fatal error

Solution Number: 1190 Applies to: COMSOL Multiphysics Versions: All versions

A "Fatal error" occurs. If you receive this error, copy and paste the entire error message and send it to support@comsol.com along with ...


Segregated solver steps do not involve all components

Solution Number: 1191 Applies to: COMSOL Multiphysics Versions: All versions

An error "Segregated solver steps do not involve all components" occurs. The groups for the segregated solver do not include all dependent variables. One reason for this error could be that some boundary conditions ...


Initial guess leads to undefined function value

Solution Number: 1192 Applies to: COMSOL Multiphysics Versions: All versions

An error "Initial guess leads to undefined function value" occurs. This error message usually appears when you have set up an expression that returns “not a value”; that is, it is undefined for the initial condition ...


Maximum number of linear iterations reached

Solution Number: 1193 Applies to: COMSOL Multiphysics Versions: All versions

An error "Maximum number of linear iterations reached" occurs. If you get this error, the iterative linear system solver did not converge due to a bad initial guess or a bad preconditioner. To avoid the error, increase ...


Singular Matrix

Solution Number: 1194 Applies to: COMSOL Multiphysics Versions: All versions

An error "Singular matrix" occurs. The system matrix (Jacobian matrix or stiffness matrix) is singular, so the solver cannot invert it. Usually this means that the system is underdetermined. Check that all equations ...


License Error

Solution Number: 1195 Applies to: COMSOL Multiphysics Versions: All versions

I receive a license error when installing, or launching, COMSOL Multiphysics, There are separate Knowledge Base entries for the most common error messages users experience. See the list under Related Issues below. If ...


'Command not found' or 'No such file or directory' error when starting the license manager on Linux

Solution Number: 1199 Versions: All versions

When I try to start the license manager for COMSOL 5.0, or later, on my Linux distribution I get an error message saying: ./lmgrd: Command not found. or ./lmgrd: No such file or directory The license manager ...