Custom validator only works on one field

I created a custom validator called FormatValidator, which validates input based on a regular expression. I also created a custom tag for the validator.
Everything works fine when I use the tag only once in a JSF page. However, when I use the tag more than once, I get the following exception:
java.lang.NullPointerException: value
     at javax.faces.webapp.UIComponentTag.isValueReference(UIComponentTag.java:227)
     at javax.faces.webapp.ValidatorTag.createValidator(ValidatorTag.java:82)
     at com.ml.gmi.eds.nigel.web.taglib.FormatValidatorTag.createValidator(FormatValidatorTag.java:34)
     at javax.faces.webapp.ValidatorTag.doStartTag(ValidatorTag.java:55)
Any ideas why?

If you have tried another set of headphones and get the same result there is a problem with the jack on the nano. Get a flashlight and check the jack, if you see debris clean it out. Otherwise you will have to get it serviced.

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