ELEMENT rule condition conflict.

Additional Information

An unconditional rule for the generic identifier 'X' has already been entered, so no other rules are permitted.
    or
Previous rules for the generic identifier 'X' have conditions, so the current one requires one as well.

Recovery

Compilation continues but no compiled source code file will be saved.

Explanation

It is an error if more than one element rule can be selected at any one time and any particular generic identifier can appear in either only one rule without a condition or several conditional rules.

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