TypeError: n.ajax is not a function

Hi @ch264
This problem is probably due to the uglify js task we use in the grunt file. We will fix this issue for the next update.
Until then, you can change the contents of the wp-ulike.min.js file to the following code:

!function(t,e,i,s){"use strict";var n={messageType:"success",messageText:"Hello World!",timeout:8e3,messageElement:"wpulike-message",notifContainer:"wpulike-notification"};function l(e,i){this.element=e,this.$element=t(e),this.settings=t.extend({},n,i),this._defaults=n,this._name="WordpressUlikeNotifications",this.init()}t.extend(l.prototype,{init:function(){this._message(),this._container(),this._append(),this._remove()},_message:function(){this.$messageElement=t("<div/>").addClass(this.settings.messageElement+" wpulike-"+this.settings.messageType).text(this.settings.messageText)},_container:function(){t("."+this.settings.notifContainer).length||this.$element.append(t("<div/>").addClass(this.settings.notifContainer)),this.$notifContainer=this.$element.find("."+this.settings.notifContainer)},_append:function(){this.$notifContainer.append(this.$messageElement).trigger("WordpressUlikeNotificationAppend")},_remove:function(){var e=this;this.$messageElement.click((function(){t(this).fadeOut(300,(function(){t(this).remove(),t("."+e.settings.messageElement).length||e.$notifContainer.remove()})).trigger("WordpressUlikeRemoveNotification")})),e.settings.timeout&&setTimeout((function(){e.$messageElement.fadeOut(300,(function(){t(this).remove(),t("."+e.settings.messageElement).length||e.$notifContainer.remove()})).trigger("WordpressUlikeRemoveNotification")}),e.settings.timeout)}}),t.fn.WordpressUlikeNotifications=function(t){return this.each((function(){new l(this,t)}))}}(jQuery,window,document),function(t,e,i,s){"use strict";t(e);var n=t(i),l={ID:0,nonce:0,type:"",append:"",appendTimeout:2e3,displayLikers:!1,disablePophover:!0,isTotal:!1,factor:"",template:"",counterSelector:".count-box",generalSelector:".wp_ulike_general_class",buttonSelector:".wp_ulike_btn",likersSelector:".wp_ulike_likers_wrapper"},a={"ulike-id":"ID","ulike-nonce":"nonce","ulike-type":"type","ulike-append":"append","ulike-is-total":"isTotal","ulike-display-likers":"displayLikers","ulike-disable-pophover":"disablePophover","ulike-append-timeout":"appendTimeout","ulike-factor":"factor","ulike-template":"template"};function o(e,i){for(var s in this.element=e,this.$element=t(e),this.settings=t.extend({},l,i),this._defaults=l,this._name="WordpressUlike",this.buttonElement=this.$element.find(this.settings.buttonSelector),this.generalElement=this.$element.find(this.settings.generalSelector),this.counterElement=this.generalElement.find(this.settings.counterSelector),this.likersElement=this.$element.find(this.settings.likersSelector),a){var n=this.buttonElement.data(s);void 0!==n&&(this.settings[a[s]]=n)}this.init()}t.extend(o.prototype,{init:function(){this.buttonElement.click(this._initLike.bind(this)),this.generalElement.one("mouseenter",this._updateLikers.bind(this))},_ajax:function(e,i){t.ajax({url:wp_ulike_params.ajax_url,type:"POST",cache:!1,dataType:"json",data:e}).done(i)},_initLike:function(t){t.stopPropagation(),this._maybeUpdateElements(t),this._updateSameButtons(),this._updateSameLikers(),this.buttonElement.prop("disabled",!0),n.trigger("WordpressUlikeLoading",this.element),this.generalElement.addClass("wp_ulike_is_loading"),this._ajax({action:"wp_ulike_process",id:this.settings.ID,nonce:this.settings.nonce,factor:this.settings.factor,type:this.settings.type,template:this.settings.template,displayLikers:this.settings.displayLikers,disablePophover:this.settings.disablePophover},function(t){this.generalElement.removeClass("wp_ulike_is_loading"),t.success?(this._updateMarkup(t),this._appendChild()):this._sendNotification("error",t.data),this.buttonElement.prop("disabled",!1),n.trigger("WordpressUlikeUpdated",this.element)}.bind(this))},_maybeUpdateElements:function(e){this.buttonElement=t(e.currentTarget),this.generalElement=this.buttonElement.closest(this.settings.generalSelector),this.counterElement=this.generalElement.find(this.settings.counterSelector),this.settings.factor=this.buttonElement.data("ulike-factor")},_appendChild:function(){if(""!==this.settings.append){var e=t(this.settings.append);this.buttonElement.append(e),this.settings.appendTimeout&&setTimeout((function(){e.detach()}),this.settings.appendTimeout)}},_updateMarkup:function(t){this._setSbilingElement(),this._setSbilingButtons(),this._updateGeneralClassNames(t.data.status),null!==t.data.data&&(t.data.status<5&&(this.__updateCounter(t.data.data),this.settings.displayLikers&&void 0!==t.data.likers&&this._updateLikersMarkup(t.data.likers)),this._updateButton(t.data.btnText,t.data.status)),this._sendNotification(t.data.messageType,t.data.message)},_updateGeneralClassNames:function(t){var e="wp_ulike_is_not_liked",i="wp_ulike_is_liked",s="wp_ulike_is_unliked",n="wp_ulike_click_is_disabled";switch(this.siblingElement.length&&this.siblingElement.removeClass(this._arrayToString([i,s])),t){case 1:this.generalElement.addClass(i).removeClass(e),this.generalElement.children().first().addClass(n);break;case 2:this.generalElement.addClass(s).removeClass(i);break;case 3:this.generalElement.addClass(i).removeClass(s);break;default:this.generalElement.addClass(n),this.siblingElement.length&&this.siblingElement.addClass(n)}},_arrayToString:function(t){return t.join(" ")},_setSbilingElement:function(){this.siblingElement=this.generalElement.siblings()},_setSbilingButtons:function(){this.siblingButton=this.buttonElement.siblings(this.settings.buttonSelector)},__updateCounter:function(t){"object"!=typeof t?this.counterElement.text(t):this.settings.isTotal&&void 0!==t.sub?this.counterElement.text(t.sub):"down"===this.settings.factor?(this.counterElement.text(t.down),this.siblingElement.length&&this.siblingElement.find(this.settings.counterSelector).text(t.up)):(this.counterElement.text(t.up),this.siblingElement.length&&this.siblingElement.find(this.settings.counterSelector).text(t.down)),n.trigger("WordpressUlikeCounterUpdated",[this.buttonElement])},_updateLikers:function(){this.settings.displayLikers&&!this.likersElement.length&&(this.generalElement.addClass("wp_ulike_is_getting_likers_list"),this._ajax({action:"wp_ulike_get_likers",id:this.settings.ID,nonce:this.settings.nonce,type:this.settings.type,displayLikers:this.settings.displayLikers,disablePophover:this.settings.disablePophover},function(t){this.generalElement.removeClass("wp_ulike_is_getting_likers_list"),t.success&&this._updateLikersMarkup(t.data)}.bind(this)))},_updateLikersMarkup:function(e){this.likersElement.length||(this.likersElement=t("<div>",{class:e.class}).appendTo(this.$element)),e.template?this.likersElement.show().html(e.template):this.likersElement.hide()},_updateSameButtons:function(){var t=void 0!==this.settings.factor?"_"+this.settings.factor:"";this.sameButtons=n.find(".wp_"+this.settings.type.toLowerCase()+t+"_btn_"+this.settings.ID),this.sameButtons.length>1&&(this.buttonElement=this.sameButtons,this.generalElement=this.buttonElement.closest(this.settings.generalSelector),this.counterElement=this.generalElement.find(this.settings.counterSelector))},_updateSameLikers:function(){this.sameLikers=n.find(".wp_"+this.settings.type.toLowerCase()+"_likers_"+this.settings.ID),this.sameLikers.length>1&&(this.likersElement=this.sameLikers)},_getLikersElement:function(){return this.likersElement},_updateButton:function(t,e){this.buttonElement.hasClass("wp_ulike_put_image")?(this.buttonElement.toggleClass("image-unlike wp_ulike_btn_is_active"),this.siblingElement.length&&this.siblingElement.find(this.settings.buttonSelector).removeClass("image-unlike wp_ulike_btn_is_active"),this.siblingButton.length&&this.siblingButton.removeClass("image-unlike wp_ulike_btn_is_active")):this.buttonElement.hasClass("wp_ulike_put_text")&&null!==t&&("object"!=typeof t?this.buttonElement.find("span").html(t):"down"===this.settings.factor?(this.buttonElement.find("span").html(t.down),this.siblingElement.length&&this.siblingElement.find(this.settings.buttonSelector).find("span").html(t.up)):(this.buttonElement.find("span").html(t.up),this.siblingElement.length&&this.siblingElement.find(this.settings.buttonSelector).find("span").html(t.down)))},_sendNotification:function(e,s){"1"===wp_ulike_params.notifications&&t(i.body).WordpressUlikeNotifications({messageType:e,messageText:s})}}),t.fn.WordpressUlike=function(e){return this.each((function(){t.data(this,"plugin_WordpressUlike")||t.data(this,"plugin_WordpressUlike",new o(this,e))}))}}(jQuery,window,document),function(t){t((function(){t(this).bind("DOMNodeInserted",(function(e){t(".wpulike").WordpressUlike()}))})),t(".wpulike").WordpressUlike()}(jQuery);

@ch264 you’re welcome.
There seems to be a problem with your JQuery! What version of Jquery are you using? Does it support the $.ajax function ?!
Also, If you also have an online link, please comment it as well.