diff --git a/Frontend Angular 4/src/app/shared/services/haskell.service.ts b/Frontend Angular 4/src/app/shared/services/haskell.service.ts
index 1cd7ff9e6022ce0b7a4404b55424d73398c42cec..690eab3f6772a9b397194db5881f4b2bc90454d7 100755
--- a/Frontend Angular 4/src/app/shared/services/haskell.service.ts	
+++ b/Frontend Angular 4/src/app/shared/services/haskell.service.ts	
@@ -38,7 +38,7 @@ export class HaskellService {
   getArchivos(cedula: string): Observable<Archivo[]> {
     let headers = this.getHeaders();
     let params: HttpParams = new HttpParams();
-    params.set("cedula", cedula);
+    params = params.set("cedula", cedula);
     let httpOptions = { headers: headers, params: params };
 
     return this.http
@@ -49,8 +49,8 @@ export class HaskellService {
   getArchivosCompartidosAlumno(cedula: string): Observable<Archivo[]> {
     let headers = this.getHeaders();
     let params: HttpParams = new HttpParams();
-    params.set("cedula", cedula);
-    params.set("compartidos", "true");
+    params = params.set("cedula", cedula);
+    params = params.set("compartidos", "true");
     let httpOptions = { headers: headers, params: params };
 
     return this.http
@@ -93,7 +93,7 @@ export class HaskellService {
   getCopiaArchivoCompartidoGrupo(cedula, archivoId): Observable<Archivo> {
     let headers = this.getHeaders();
     let params: HttpParams = new HttpParams();
-    params.set("cedula", cedula);
+    params = params.set("cedula", cedula);
     let httpOptions = { headers: headers, params: params };
 
     return this.http
@@ -148,7 +148,7 @@ export class HaskellService {
   getGrupos(cedula: string): Observable<Grupo[]> {
     let headers = this.getHeaders();
     let params: HttpParams = new HttpParams();
-    params.set("cedula", cedula);
+    params = params.set("cedula", cedula);
     let httpOptions = { headers: headers, params: params };
 
     return this.http