Problema con i filtri

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Problema con i filtri

Ho un problemino con views. Appena aggiungo un filtro mi da una pagina bianca con quest'errore. Ne posto solo la parte iniziale. Sono su altervista, quale potrebbe essere il problema? Ecco il codice:

Quote:
{ "display": "\x3cform action=\"/?q=admin/build/views/ajax/add-item/listaserate/default/filter\" accept-charset=\"UTF-8\" method=\"post\" id=\"views-ui-config-item-form\"\x3e\n\x3cdiv\x3e\x3cdiv class=\"views-expose clear-block\"\x3e\x3cspan class=\"button\"\x3e\x3cinput type=\"submit\" name=\"op\" id=\"edit-options-expose-button-button\" value=\"Expose\" class=\"form-submit\" /\x3e\x3c/span\x3e\n\x3cdiv class=\"description\"\x3eThis item is currently not exposed. If you \x3cstrong\x3eexpose\x3c/strong\x3e it, users will be able to change the filter as they view it.\x3c/div\x3e\x3c/div\x3e\x3cdiv class=\"clear-block\"\x3e\x3cdiv class=\"views-left-30\"\x3e\x3cdiv class=\"form-item\"\x3e\n \x3clabel\x3eOperator: \x3c/label\x3e\n \x3cdiv class=\"form-radios\"\x3e\x3cdiv class=\"form-item\" id=\"edit-options-operator-in-wrapper\"\x3e\n \x3clabel class=\"option\" for=\"edit-options-operator-in\"\x3e\x3cinput type=\"radio\" id=\"edit-options-operator-in\" name=\"options[operator]\" value=\"in\" checked=\"checked\" class=\"form-radio\" /\x3e Is one of\x3c/label\x3e\n\x3c/div\x3e\n\x3cdiv class=\"form-item\" id=\"edit-options-operator-not-in-wrapper\"\x3e\n \x3clabel class=\"option\" for=\"edit-options-operator-not-in\"\x3e\x3cinput type=\"radio\" id=\"edit-options-operator-not-in\" name=\"options[operator]\" value=\"not in\" class=\"form-radio\" /\x3e Is not one of\x3c/label\x3e\n\x3c/div\x3e\n\x3c/div\x3e\n...