AJAX error

The mudle is not operational because of an ajax-error.
Whenever I click on a term (which is a partent-tern to two terms), I get a pop-op window entitles "The page at http://localhost says:" And that's what it says:

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /fjmk-dev/system/ajax
StatusText: OK
ResponseText: [{"command":"settings","settings":{"basePath":"\/fjmk-dev\/","ajaxPageState":{"theme":"seven","theme_token":"y7UyuZ7BMFWAq5BkuIPMOk_BhvrZ-ue2dVlLpXSFUBA","css":{"misc\/ui\/jquery.ui.core.css":1,"misc\/ui\/jquery.ui.theme.css":1,"modules\/overlay\/overlay-parent.css":1,"modules\/filter\/filter.css":1},"js":{"misc\/ui\/jquery.ui.core.min.js":1,"misc\/jquery.ba-bbq.js":1,"modules\/overlay\/overlay-parent.js":1,"misc\/tabledrag.js":1,"modules\/filter\/filter.js":1,"misc\/tableheader.js":1}},"overlay":{"paths":{"admin":"node\/*\/edit\nnode\/*\/delete\nnode\/*\/revisions\nnode\/*\/revisions\/*\/revert\nnode\/*\/revisions\/*\/delete\nnode\/add\nnode\/add\/*\noverlay\/dismiss-message\nuser\/*\/shortcuts\nadmin\nadmin\/*\nbatch\ntaxonomy\/term\/*\/edit\nuser\/*\/cancel\nuser\/*\/edit\nuser\/*\/edit\/*\ndevel\/*\nnode\/*\/devel\nnode\/*\/devel\/*\ncomment\/*\/devel\ncomment\/*\/devel\/*\nuser\/*\/devel\nuser\/*\/devel\/*\ntaxonomy\/term\/*\/devel\ntaxonomy\/term\/*\/devel\/*","non_admin":"admin\/structure\/block\/demo\/*\nadmin\/reports\/status\/php"},"ajaxCallback":"overlay-ajax"},"admin_menu":{"destination":"destination=system\/ajax","hash":"cbedae0c5b3ffc176d5580fbf2f273e0","basePath":"\/fjmk-dev\/admin_menu","replacements":{".admin-menu-users a":"0 \/ 1"},"margin_top":1,"toolbar":[]},"siblingsForm":{"url":"\/fjmk-dev\/admin\/structure\/taxonomy_manager\/siblingsform","modulePath":"modules\/taxonomy_manager\/"},"childForm":{"url":"\/fjmk-dev\/admin\/structure\/taxonomy_manager\/childform","modulePath":"modules\/taxonomy_manager\/"},"taxonomytree":[{"id":"taxonomy-manager-tree","vid":"2"}],"ajax":{"edit-synonyms-synonym-und-add-more":{"callback":"field_add_more_js","wrapper":"synonyms-synonym-add-more-wrapper","effect":"fade","event":"mousedown","keypress":true,"url":"\/fjmk-dev\/system\/ajax","submit":{"_triggering_element_name":"synonyms_synonym_add_more","_triggering_element_value":"Add another item"}},"edit-save":{"callback":"taxonomy_manager_term_data_form_ajax_callback","method":"replaceWith","event":"click","wrapper":"taxonomy-term-data-replace","progress":{"type":""},"url":"\/fjmk-dev\/system\/ajax","submit":{"_triggering_element_name":"op","_triggering_element_value":"Save changes"}},"edit-parents-op-add-button":{"callback":"taxonomy_manager_term_data_form_ajax_callback","progress":{"type":""},"method":"replaceWith","event":"click","wrapper":"taxonomy-term-data-replace","url":"\/fjmk-dev\/system\/ajax","submit":{"_triggering_element_name":"parents[op][add_button]"}}},"tableDrag":{"synonyms-synonym-values":{"synonyms_synonym-delta-order":[{"target":"synonyms_synonym-delta-order","source":"synonyms_synonym-delta-order","relationship":"sibling","action":"order","hidden":true,"limit":0}]}}},"merge":true},{"command":"insert","method":"prepend","selector":"head","data":"\u003cstyle type=\"text\/css\" media=\"all\"\u003e@import url(\"http:\/\/localhost\/fjmk-dev\/misc\/ui\/jquery.ui.core.css?lgv6bz\");\n@import url(\"http:\/\/localhost\/fjmk-dev\/themes\/seven\/jquery.ui.theme.css?lgv6bz\");\n@import url(\"http:\/\/localhost\/fjmk-dev\/modules\/overlay\/overlay-parent.css?lgv6bz\");\u003c\/style\u003e\n\u003cstyle type=\"text\/css\" media=\"all\"\u003e@import url(\"http:\/\/localhost\/fjmk-dev\/modules\/filter\/filter.css?lgv6bz\");\u003c\/style\u003e\n","settings":null},{"command":"insert","method":"prepend","selector":"head","data":"\u003cscript type=\"text\/javascript\" src=\"http:\/\/localhost\/fjmk-dev\/misc\/ui\/jquery.ui.core.min.js?v=1.8.7\"\u003e\u003c\/script\u003e\n\u003cscript type=\"text\/javascript\" src=\"http:\/\/localhost\/fjmk-dev\/misc\/jquery.ba-bbq.js?v=1.2.1\"\u003e\u003c\/script\u003e\n\u003cscript type=\"text\/javascript\" src=\"http:\/\/localhost\/fjmk-dev\/modules\/overlay\/overlay-parent.js?v=1.0\"\u003e\u003c\/script\u003e\n\u003cscript type=\"text\/javascript\" src=\"http:\/\/localhost\/fjmk-dev\/misc\/tabledrag.js?lgv6bz\"\u003e\u003c\/script\u003e\n\u003cscript type=\"text\/javascript\" src=\"http:\/\/localhost\/fjmk-dev\/modules\/filter\/filter.js?lgv6bz\"\u003e\u003c\/script\u003e\n\u003cscript type=\"text\/javascript\" src=\"http:\/\/localhost\/fjmk-dev\/misc\/tableheader.js?lgv6bz\"\u003e\u003c\/script\u003e\n","settings":null},{"command":"insert","method":null,"selector":null,"data":"\u003cdiv id=\"taxonomy-term-data-replace\"\u003e\u003cfieldset class=\"form-wrapper\" id=\"edit-\"\u003e\u003clegend\u003e\u003cspan class=\"fieldset-legend\"\u003e\u0415\u0432\u0440\u043e\u043f\u0430 (1)\u003c\/span\u003e\u003c\/legend\u003e\u003cdiv class=\"fieldset-wrapper\"\u003e\u003cdiv id=\"term-data-close\"\u003e\u003cspan title=\"Close\"\u003e\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u003c\/span\u003e\u003c\/div\u003e\u003cdiv class=\"form-item form-type-textfield form-item-name\"\u003e\n \u003clabel for=\"edit-name\"\u003eName \u003cspan class=\"form-required\" title=\"This field is required.\"\u003e*\u003c\/span\u003e\u003c\/label\u003e\n \u003cinput type=\"text\" id=\"edit-name\" name=\"name\" value=\"\u0415\u0432\u0440\u043e\u043f\u0430\" size=\"60\" maxlength=\"255\" class=\"form-text required\" \/\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"text-format-wrapper\"\u003e\u003cdiv class=\"form-item form-type-textarea form-item-description-value\"\u003e\n \u003clabel for=\"edit-description-value\"\u003eDescription \u003c\/label\u003e\n \u003cdiv class=\"form-textarea-wrapper resizable\"\u003e\u003ctextarea id=\"edit-description-value\" name=\"description[value]\" cols=\"60\" rows=\"2\" class=\"form-textarea\"\u003e\u003c\/textarea\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cfieldset class=\"filter-wrapper form-wrapper\" id=\"edit-description-format\"\u003e\u003cdiv class=\"fieldset-wrapper\"\u003e\u003cdiv class=\"filter-help form-wrapper\" id=\"edit-description-format-help\"\u003e\u003cp\u003e\u003ca href=\"\/fjmk-dev\/filter\/tips\"\u003eMore information about text formats\u003c\/a\u003e\u003c\/p\u003e\u003c\/div\u003e\u003cdiv class=\"form-item form-type-select form-item-description-format\"\u003e\n \u003clabel for=\"edit-description-format--2\"\u003eText format \u003c\/label\u003e\n \u003cselect class=\"filter-list form-select\" id=\"edit-description-format--2\" name=\"description[format]\"\u003e\u003coption value=\"filtered_html\" selected=\"selected\"\u003eFiltered HTML\u003c\/option\u003e\u003coption value=\"full_html\"\u003eFull HTML\u003c\/option\u003e\u003coption value=\"plain_text\"\u003ePlain text\u003c\/option\u003e\u003c\/select\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"filter-guidelines form-wrapper\" id=\"edit-description-format-guidelines\"\u003e\u003cdiv class=\"filter-guidelines-item filter-guidelines-filtered_html\"\u003e\u003ch3\u003eFiltered HTML\u003c\/h3\u003e\u003cul class=\"tips\"\u003e\u003cli\u003eWeb page addresses and e-mail addresses turn into links automatically.\u003c\/li\u003e\u003cli\u003eAllowed HTML tags: \u0026lt;a\u0026gt; \u0026lt;em\u0026gt; \u0026lt;strong\u0026gt; \u0026lt;cite\u0026gt; \u0026lt;blockquote\u0026gt; \u0026lt;code\u0026gt; \u0026lt;ul\u0026gt; \u0026lt;ol\u0026gt; \u0026lt;li\u0026gt; \u0026lt;dl\u0026gt; \u0026lt;dt\u0026gt; \u0026lt;dd\u0026gt; \u0026lt;i\u0026gt; \u0026lt;b\u0026gt;\u003c\/li\u003e\u003cli\u003eLines and paragraphs break automatically.\u003c\/li\u003e\u003c\/ul\u003e\u003c\/div\u003e\u003cdiv class=\"filter-guidelines-item filter-guidelines-full_html\"\u003e\u003ch3\u003eFull HTML\u003c\/h3\u003e\u003cul class=\"tips\"\u003e\u003cli\u003eWeb page addresses and e-mail addresses turn into links automatically.\u003c\/li\u003e\u003cli\u003eLines and paragraphs break automatically.\u003c\/li\u003e\u003c\/ul\u003e\u003c\/div\u003e\u003cdiv class=\"filter-guidelines-item filter-guidelines-plain_text\"\u003e\u003ch3\u003ePlain text\u003c\/h3\u003e\u003cul class=\"tips\"\u003e\u003cli\u003eNo HTML tags allowed.\u003c\/li\u003e\u003cli\u003eWeb page addresses and e-mail addresses turn into links automatically.\u003c\/li\u003e\u003cli\u003eLines and paragraphs break automatically.\u003c\/li\u003e\u003c\/ul\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/fieldset\u003e\n\u003c\/div\u003e\n\u003cinput type=\"hidden\" name=\"vid\" value=\"2\" \/\u003e\n\u003cinput type=\"hidden\" name=\"tid\" value=\"1\" \/\u003e\n\u003cdiv class=\"form-item form-type-textfield form-item-weight\"\u003e\n \u003clabel for=\"edit-weight\"\u003eWeight \u003cspan class=\"form-required\" title=\"This field is required.\"\u003e*\u003c\/span\u003e\u003c\/label\u003e\n \u003cinput type=\"text\" id=\"edit-weight\" name=\"weight\" value=\"0\" size=\"6\" maxlength=\"128\" class=\"form-text required\" \/\u003e\n\u003cdiv class=\"description\"\u003eTerms are displayed in ascending order by weight.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"field-type-text field-name-synonyms-synonym field-widget-text-textfield form-wrapper\" id=\"edit-synonyms-synonym\"\u003e\u003cdiv id=\"synonyms-synonym-add-more-wrapper\"\u003e\u003cdiv class=\"form-item\"\u003e\u003ctable id=\"synonyms-synonym-values\" class=\"field-multiple-table sticky-enabled\"\u003e\n \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\" class=\"field-label\"\u003e\u003clabel\u003eSynonyms: \u003c\/label\u003e\u003c\/th\u003e\u003cth\u003eOrder\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n \u003ctr class=\"draggable odd\"\u003e\u003ctd class=\"field-multiple-drag\"\u003e\u003c\/td\u003e\u003ctd\u003e\u003cdiv class=\"form-item form-type-textfield form-item-synonyms-synonym-und-0-value\"\u003e\n \u003cinput class=\"text-full form-text\" type=\"text\" id=\"edit-synonyms-synonym-und-0-value\" name=\"synonyms_synonym[und][0][value]\" value=\"\" size=\"60\" maxlength=\"255\" \/\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\u003ctd class=\"delta-order\"\u003e\u003cdiv class=\"form-item form-type-select

The module is not operational!