# ID 21441

Variable type in external variable structure unknown.
Description | User-defined variable types can be defined for external variables, e.g. for variable structures (see [EXTV]). However, the variable type of a structure element (type[I].element[j].type) is unknown. It must be a default variable type of the controller or a self-defined type.
Response | Class | 2 | The external variable is deleted.
Solution | Class | 3 | Correct the variable type of the structure element.
Parameter | %1: | Current value [-]
Name of the variable structure
%2: | Current value [-]
Name of the affected external variable
%3: | Error value [-]
Name of the unknown variable type
Error type | 1, Error message from NC program.