jQuery Grid Plugin - jqGrid

I am getting a few errors and are unsure how to fix them. First, I downloaded the latest source and applied it accordingly. I copy and pasted the source code from the examples and placed it into the body of my page. Every page load I get the following:
11: TypeError: Undefined Value - grid.formedit-min.js

Line 11= ;(function($){$.jgrid.search={caption:"Search...",Find:"Find",Reset:"Reset",odata:['equal','not equal','less','less or equal','greater','greater or equal','begins with','ends with','contains']};$.jgrid.edit={addCaption:"Add Record",editCaption:"Edit Record",bSubmit:"Submit",bCancel:"Cancel",processData:"Processing...",mtype:"POST",msg:{required:"Field is required",number:"Please enter valid number!",minValue:"value must be greater than or equal to ",maxValue:"value must be less than or equal to"}};$.jgrid.del={caption:"Delete",msg:"Delete selected record(s)?",bSubmit:"Delete",bCancel:"Cancel",processData:"Processing...",mtype:"POST"};$.jgrid.nav={edittext:" ",edittitle:"Edit selected row",addtext:" ",addtitle:"Add new row",deltext:" ",deltitle:"Delete selected row",searchtext:" ",searchtitle:"Find records",refreshtext:"",refreshtitle:"Reload Grid",alertcap:"Warning!",alerttext:"Please, select Row!"};$.fn.extend({searchGrid:function(p){p=$.extend({top:0,left:0,width:360,height:70,modal:false,drag:true,closeicon:'ico-close.gif',dirty:false,sField:'searchField',sValue:'searchString',sOper:'searchOper',processData:"",sopt:null},$.jgrid.search,p||{});return this.each(function(){var $t=this;if(!$t.grid)return;if(!p.imgpath)p.imgpath=$t.p.imgpath;var gID=$("table:first",$t.grid.bDiv).attr("id");var IDs={themodal:'srchmod'+gID,modalhead:'srchhead'+gID,modalcontent:'srchcnt'+gID};if($("#"+IDs.themodal).html()!=null){viewModal("#"+IDs.themodal,{modal:p.modal});}else{var cM=$t.p.colModel;var cNames="<select id='snames' class='search'>";var nm,hc,sf;for(var i=0;i<cM.length;i++){nm=cM[i].name;hc=(cM[i].hidden==true)?true:false;sf=(cM[i].search==false)?false:true;if(nm!=='cb'&&nm!=='subgrid'&&sf&&!hc){var sname=(cM[i].index)?cM[i].index:nm;cNames+="<option value='"+sname+"'>"+$t.p.colNames[i]+"</option>";}}

50: TypeError: Value undefined (result of expression jQuery#navgrid").jqGrid) is not an object. - admin.lasso 

this = {height:280,reloadAfterSubmit:false}, // add options