diff --git a/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/AuthenticationService.java b/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/AuthenticationService.java
index a2f11bdc3565..4f6f8c220c17 100644
--- a/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/AuthenticationService.java
+++ b/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/AuthenticationService.java
@@ -69,7 +69,8 @@ public AuthServiceResponse handleAuthentication(AuthServiceRequest authRequest)
         try {
             commonAuthenticationHandler.doPost(wrappedRequest, wrappedResponse);
         } catch (ServletException | IOException e) {
-            throw new AuthServiceException("Error while handling authentication request.", e);
+            throw new AuthServiceException(AuthServiceConstants.ErrorMessage.ERROR_UNABLE_TO_PROCEED.code(),
+                    AuthServiceConstants.ErrorMessage.ERROR_UNABLE_TO_PROCEED.description(), e);
         }
 
         return processCommonAuthResponse(wrappedRequest, wrappedResponse);
@@ -100,7 +101,9 @@ private AuthServiceResponse processCommonAuthResponse(AuthServiceRequestWrapper
         } else if (isAuthFlowIncomplete(request)) {
             handleIntermediateAuthResponse(request, response, authServiceResponse);
         } else {
-            throw new AuthServiceException("Unknown authentication flow status: " + request.getAuthFlowStatus());
+            throw new AuthServiceException(AuthServiceConstants.ErrorMessage.ERROR_UNKNOWN_AUTH_FLOW_STATUS.code(),
+                    String.format(AuthServiceConstants.ErrorMessage.ERROR_UNKNOWN_AUTH_FLOW_STATUS.description(),
+                            request.getAuthFlowStatus()));
         }
 
         return authServiceResponse;
@@ -201,7 +204,9 @@ private List<AuthenticatorData> getAuthenticatorBasicData(String authenticatorLi
 
             ApplicationAuthenticator authenticator = FrameworkUtils.getAppAuthenticatorByName(name);
             if (authenticator == null) {
-                throw new AuthServiceException("Authenticator not found for name: " + name);
+                throw new AuthServiceException(AuthServiceConstants.ErrorMessage.ERROR_AUTHENTICATOR_NOT_FOUND.code(),
+                        String.format(AuthServiceConstants.ErrorMessage.ERROR_AUTHENTICATOR_NOT_FOUND.description(),
+                                name));
             }
 
             if (!authenticator.isAPIBasedAuthenticationSupported()) {
diff --git a/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/util/auth/service/AuthServiceConstants.java b/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/util/auth/service/AuthServiceConstants.java
index 3a2957126926..bd0ec0405397 100644
--- a/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/util/auth/service/AuthServiceConstants.java
+++ b/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/util/auth/service/AuthServiceConstants.java
@@ -44,5 +44,71 @@ public enum FlowStatus {
     public static final String ERROR_CODE_PARAM = "errorCode";
     public static final String ERROR_CODE_UNKNOWN_ERROR = "UNKNOWN_ERROR";
     public static final String ERROR_MSG_UNKNOWN_ERROR = "Unknown error occurred.";
+    public static final String ERROR_CODE_PREFIX = "ABA-";
 
+    /**
+     * Enum for error messages.
+     */
+    public enum ErrorMessage {
+
+        // Client errors starting from 600xx.
+        ERROR_AUTH_REQUEST("60001",
+                "Invalid authentication request.",
+                "Received authentication request is invalid."),
+        ERROR_INVALID_AUTHENTICATOR_ID("60002",
+                "Invalid authenticatorId.",
+                "Provided authenticatorId %s is invalid."),
+
+        // Server Error starting from 650xx.
+        ERROR_UNABLE_TO_PROCEED("65001",
+                "Unable to proceed with authentication.",
+                "Server encountered an error while processing the authentication request."),
+        ERROR_AUTHENTICATOR_NOT_FOUND("65002",
+                "Unable to find authenticator.",
+                "Authenticator not found for name: %s"),
+        ERROR_UNKNOWN_AUTH_FLOW_STATUS("65003",
+                "Unknown authentication flow status.",
+                "Unknown authentication flow status: %s");
+        private final String code;
+        private final String message;
+        private final String description;
+
+        ErrorMessage(String code, String message, String description) {
+
+            this.code = code;
+            this.message = message;
+            this.description = description;
+        }
+
+        public String code() {
+
+            return ERROR_CODE_PREFIX + code;
+        }
+
+        public String message() {
+
+            return message;
+        }
+
+        public String description() {
+
+            return description;
+        }
+
+        public ErrorMessage fromCode(String code) {
+
+            for (ErrorMessage error : ErrorMessage.values()) {
+                if (error.code.equals(code)) {
+                    return error;
+                }
+            }
+            return null;
+        }
+
+        @Override
+        public String toString() {
+
+            return code + " | " + message;
+        }
+    }
 }
diff --git a/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/util/auth/service/AuthServiceUtils.java b/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/util/auth/service/AuthServiceUtils.java
index 0d923bcd64c0..44b103c13241 100644
--- a/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/util/auth/service/AuthServiceUtils.java
+++ b/components/authentication-framework/org.wso2.carbon.identity.application.authentication.framework/src/main/java/org/wso2/carbon/identity/application/authentication/framework/util/auth/service/AuthServiceUtils.java
@@ -62,7 +62,8 @@ public static Map<String, String> extractQueryParams(String url) throws AuthServ
                 }
             }
         } catch (URISyntaxException | UnsupportedEncodingException e) {
-            throw new AuthServiceException("Error while extracting query params from provided url.", e);
+            throw new AuthServiceException(AuthServiceConstants.ErrorMessage.ERROR_UNABLE_TO_PROCEED.code(),
+                    "Error while extracting query params from provided url.", e);
         }
         return queryParams;
     }