code: public RolloutGroupConditionBuilder errorCondition(final RolloutGroupErrorCondition condition,
              final String expression) {
          conditions.setErrorCondition(condition);
          conditions.setErrorConditionExp(expression);
          return this;
      }
docs: Sets the error condition and expression on the builder.
  
  @param condition
  the error condition
  @param expression
  the error expression
  @return the builder itself