diff --git a/dist/facade/LanguageServiceFacade.js b/dist/facade/LanguageServiceFacade.js
index 1f1b26e..901b0a6 100644
--- a/dist/facade/LanguageServiceFacade.js
+++ b/dist/facade/LanguageServiceFacade.js
@@ -18,22 +18,33 @@ var LanguageServiceFacade = /** @class */ (function () {
             }, LanguageServiceFacade.timeout);
         });
         var result = LanguageServiceFacade.GetParseResult(str, parseReason);
+        var workingWorker = (parseReason === ParseReason.GetCompletionWords ? LanguageServiceFacade.workingWorkerForCompletion : LanguageServiceFacade.workingWorkerForGettingError);
         return Q.race([timeExceeded, result]).then(function (words) {
-            LanguageServiceFacade.workingWorker.terminate();
+            workingWorker.terminate();
             return words;
         });
     };
     LanguageServiceFacade.timeout = 2000;
-    LanguageServiceFacade.workingWorker = null;
+    LanguageServiceFacade.workingWorkerForCompletion = null;
+    LanguageServiceFacade.workingWorkerForGettingError = null;
     LanguageServiceFacade.GetParseResult = function (str, parseReason) {
         return Q.Promise(function (resolve) {
-            if (LanguageServiceFacade.workingWorker != null) {
-                LanguageServiceFacade.workingWorker.terminate();
+            var workingWorker = (parseReason === ParseReason.GetCompletionWords ? LanguageServiceFacade.workingWorkerForCompletion : LanguageServiceFacade.workingWorkerForGettingError);
+            // terminate the expired worker.
+            if (workingWorker != null) {
+                workingWorker.terminate();
             }
             var currentUrlWithoutQueryParamsAndHashRoute = window.location.protocol + "//" + window.location.host + window.location.pathname;
             var url = currentUrlWithoutQueryParamsAndHashRoute.replace(/\/[^\/]*$/, '/node_modules/@azure/cosmos-language-service/dist/worker/dist/LanguageServiceWorker.js');
-            LanguageServiceFacade.workingWorker = new Worker(url);
-            LanguageServiceFacade.workingWorker.onmessage = function (ev) {
+            if (parseReason === ParseReason.GetCompletionWords) {
+                LanguageServiceFacade.workingWorkerForCompletion = new Worker(url);
+                workingWorker = LanguageServiceFacade.workingWorkerForCompletion;
+            }
+            else {
+                LanguageServiceFacade.workingWorkerForGettingError = new Worker(url);
+                workingWorker = LanguageServiceFacade.workingWorkerForGettingError;
+            }
+            workingWorker.onmessage = function (ev) {
                 var processedResults = [];
                 var parseResults = ev.data;
                 if (parseReason === ParseReason.GetCompletionWords) {
@@ -68,7 +79,7 @@ var LanguageServiceFacade = /** @class */ (function () {
                 code: str,
                 reason: parseReason
             };
-            LanguageServiceFacade.workingWorker.postMessage(source);
+            workingWorker.postMessage(source);
         });
     };
     return LanguageServiceFacade;
diff --git a/dist/facade/LanguageServiceFacade.js.map b/dist/facade/LanguageServiceFacade.js.map
index 9248b63..fa4f5dd 100644
--- a/dist/facade/LanguageServiceFacade.js.map
+++ b/dist/facade/LanguageServiceFacade.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"LanguageServiceFacade.js","sourceRoot":"","sources":["../../src/facade/LanguageServiceFacade.ts"],"names":[],"mappings":";;AAAA,qBAAuB;AACvB,+CAAgE;AAEhE,IAAY,WAGX;AAHD,WAAY,WAAW;IACnB,yEAAsB,CAAA;IACtB,uDAAa,CAAA;AACjB,CAAC,EAHW,WAAW,GAAX,mBAAW,KAAX,mBAAW,QAGtB;AAED;IAAA;IAkFA,CAAC;IA5EiB,mDAA6B,GAA3C,UAA4C,GAAY,EAAE,WAAyB;QAC/E,IAAM,YAAY,GAAG,CAAC,CAAC,OAAO,CAAM,UAAC,OAAa,EAAE,MAAY;YAC5D,IAAM,IAAI,GAAG,UAAU,CAAC;gBACpB,IAAM,KAAK,GAAS,EAAE,CAAC;gBACvB,OAAO,CAAC,KAAK,CAAC,CAAC;YACnB,CAAC,EAAE,qBAAqB,CAAC,OAAO,CAAC,CAAC;QACtC,CAAC,CAAC,CAAC;QAEH,IAAM,MAAM,GAAG,qBAAqB,CAAC,cAAc,CAAC,GAAG,EAAE,WAAW,CAAC,CAAC;QACtE,IAAI,aAAa,GAAG,CAAC,WAAW,KAAK,WAAW,CAAC,kBAAkB,CAAC,CAAC,CAAC,qBAAqB,CAAC,0BAA0B,CAAC,CAAC,CAAC,qBAAqB,CAAC,4BAA4B,CAAC,CAAC;QAC7K,OAAO,CAAC,CAAC,IAAI,CAAC,CAAC,YAAY,EAAE,MAAM,CAAC,CAAC,CAAC,IAAI,CAAC,UAAS,KAAK;YACrD,aAAa,CAAC,SAAS,EAAE,CAAC;YAC1B,OAAO,KAAK,CAAC;QACjB,CAAC,CAAC,CAAC;IACP,CAAC;IAnBuB,6BAAO,GAAY,IAAI,CAAC;IAEjC,gDAA0B,GAAY,IAAI,CAAC;IAC3C,kDAA4B,GAAY,IAAI,CAAC;IAkB7C,oCAAc,GAAG,UAAC,GAAY,EAAE,WAAyB;QACpE,OAAO,CAAC,CAAC,OAAO,CAAC,UAAC,OAAa;YAE3B,IAAI,aAAa,GAAG,CAAC,WAAW,KAAK,WAAW,CAAC,kBAAkB,CAAC,CAAC,CAAC,qBAAqB,CAAC,0BAA0B,CAAC,CAAC,CAAC,qBAAqB,CAAC,4BAA4B,CAAC,CAAC;YAE7K,gCAAgC;YAChC,IAAI,aAAa,IAAI,IAAI,EAAE;gBACvB,aAAa,CAAC,SAAS,EAAE,CAAC;aAC7B;YAED,IAAM,wCAAwC,GAAc,MAAM,CAAC,QAAQ,CAAC,QAAQ,UAAK,MAAM,CAAC,QAAQ,CAAC,IAAI,GAAG,MAAM,CAAC,QAAQ,CAAC,QAAU,CAAC;YAC3I,IAAI,GAAG,GAAG,wCAAwC,CAAC,OAAO,CAAC,WAAW,EAAE,wFAAwF,CAAC,CAAC;YAElK,IAAG,WAAW,KAAK,WAAW,CAAC,kBAAkB,EAAE;gBAC/C,qBAAqB,CAAC,0BAA0B,GAAG,IAAI,MAAM,CAAC,GAAG,CAAC,CAAC;gBACnE,aAAa,GAAG,qBAAqB,CAAC,0BAA0B,CAAC;aACpE;iBAAM;gBACH,qBAAqB,CAAC,4BAA4B,GAAG,IAAI,MAAM,CAAC,GAAG,CAAC,CAAC;gBACrE,aAAa,GAAG,qBAAqB,CAAC,4BAA4B,CAAC;aACtE;YAED,aAAa,CAAC,SAAS,GAAG,UAAC,EAAiB;gBACxC,IAAI,gBAAgB,GAAU,EAAE,CAAC;gBACjC,IAAI,YAAY,GAAU,EAAE,CAAC,IAAI,CAAC;gBAElC,IAAI,WAAW,KAAK,WAAW,CAAC,kBAAkB,EAAE;oBAChD,YAAY,CAAC,OAAO,CAAC,UAAC,KAAa;wBAC/B,IAAI,CAAC,CAAC,KAAK,EAAE;4BACT,gBAAgB,CAAC,IAAI,CAAC;gCAClB,KAAK,EAAE,KAAK;gCACZ,UAAU,EAAE,KAAK;gCACjB,IAAI,EAAE,yBAAS,CAAC,kBAAkB,CAAC,OAAO;6BAC7C,CAAC,CAAC;yBACN;oBACL,CAAC,CAAC,CAAC;oBACH,IAAI,WAAW,GAA8B,EAAC,WAAW,EAAG,gBAAgB,EAAC,CAAC;oBAC9E,OAAO,CAAC,WAAW,CAAC,CAAC;iBACxB;qBAAM,IAAI,WAAW,KAAK,WAAW,CAAC,SAAS,EAAE;oBAC9C,YAAY,CAAC,OAAO,CAAC,UAAC,GAAQ;wBAC1B,IAAM,IAAI,GAAuB;4BAC7B,QAAQ,EAAE,8BAAc,CAAC,KAAK;4BAC9B,OAAO,EAAE,GAAG,CAAC,OAAO;4BACpB,eAAe,EAAE,GAAG,CAAC,IAAI;4BACzB,WAAW,EAAE,GAAG,CAAC,MAAM;4BACvB,aAAa,EAAE,GAAG,CAAC,IAAI;4BACvB,SAAS,EAAE,GAAG,CAAC,MAAM;yBACxB,CAAC;wBACF,gBAAgB,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC;oBAChC,CAAC,CAAC,CAAC;oBACH,OAAO,CAAC,gBAAgB,CAAC,CAAC;iBAC7B;YACL,CAAC,CAAA;YAED,IAAM,MAAM,GAAG;gBACX,IAAI,EAAG,GAAG;gBACV,MAAM,EAAG,WAAW;aACvB,CAAC;YACF,aAAa,CAAC,WAAW,CAAC,MAAM,CAAC,CAAC;QACtC,CAAC,CAAC,CAAC;IACP,CAAC,CAAA;IACL,4BAAC;CAAA,AAlFD,IAkFC;AAlFY,sDAAqB"}
\ No newline at end of file
diff --git a/src/facade/LanguageServiceFacade.ts b/src/facade/LanguageServiceFacade.ts
index 0e16600..62003d3 100644
--- a/src/facade/LanguageServiceFacade.ts
+++ b/src/facade/LanguageServiceFacade.ts
@@ -9,8 +9,9 @@ export enum ParseReason {
 export class LanguageServiceFacade {
     private static readonly timeout : number = 2000;
 
-    private static workingWorker : Worker = null; 
-
+    private static workingWorkerForCompletion : Worker = null; 
+    private static workingWorkerForGettingError : Worker = null;
+    
     public static GetLanguageServiceParseResult(str : string, parseReason : ParseReason) : Q.Promise<any> {  
         const timeExceeded = Q.Promise<any>((resolve : any, reject : any) => {
             const wait = setTimeout(() => {
@@ -20,23 +21,35 @@ export class LanguageServiceFacade {
         });
 
         const result = LanguageServiceFacade.GetParseResult(str, parseReason);
+        let workingWorker = (parseReason === ParseReason.GetCompletionWords ? LanguageServiceFacade.workingWorkerForCompletion : LanguageServiceFacade.workingWorkerForGettingError);
         return Q.race([timeExceeded, result]).then(function(words) {
-            LanguageServiceFacade.workingWorker.terminate();
+            workingWorker.terminate();
             return words;
         });
     }
 
     private static GetParseResult = (str : string, parseReason : ParseReason) : Q.Promise<any> => {
         return Q.Promise((resolve : any) => {
-            if (LanguageServiceFacade.workingWorker != null) {
-                LanguageServiceFacade.workingWorker.terminate();
+
+            let workingWorker = (parseReason === ParseReason.GetCompletionWords ? LanguageServiceFacade.workingWorkerForCompletion : LanguageServiceFacade.workingWorkerForGettingError);
+
+            // terminate the expired worker.
+            if (workingWorker != null) {
+                workingWorker.terminate();
             }
             
             const currentUrlWithoutQueryParamsAndHashRoute: string = `${window.location.protocol}//${window.location.host}${window.location.pathname}`;
             let url = currentUrlWithoutQueryParamsAndHashRoute.replace(/\/[^\/]*$/, '/node_modules/@azure/cosmos-language-service/dist/worker/dist/LanguageServiceWorker.js');
-            LanguageServiceFacade.workingWorker = new Worker(url);  
+            
+            if(parseReason === ParseReason.GetCompletionWords) {
+                LanguageServiceFacade.workingWorkerForCompletion = new Worker(url);
+                workingWorker = LanguageServiceFacade.workingWorkerForCompletion;
+            } else {
+                LanguageServiceFacade.workingWorkerForGettingError = new Worker(url);
+                workingWorker = LanguageServiceFacade.workingWorkerForGettingError;
+            }
 
-            LanguageServiceFacade.workingWorker.onmessage = (ev : MessageEvent) => {
+            workingWorker.onmessage = (ev : MessageEvent) => {
                 var processedResults: any[] = [];  
                 var parseResults: any[] = ev.data;
                 
@@ -72,7 +85,7 @@ export class LanguageServiceFacade {
                 code : str,
                 reason : parseReason
             };
-            LanguageServiceFacade.workingWorker.postMessage(source);
+            workingWorker.postMessage(source);
         });
     }
 }