diff --git a/apps/drive-web/src/lib/error.ts b/apps/drive-web/src/lib/error.ts
index 4e3590b..0cf5564 100644
--- a/apps/drive-web/src/lib/error.ts
+++ b/apps/drive-web/src/lib/error.ts
@@ -1,7 +1,9 @@
 import {
-	Code as ErrorCode,
+	type ApplicationErrorData,
+	ErrorCode,
 	isApplicationError,
 } from "@fileone/convex/error"
+import { ConvexError } from "convex/values"
 import { toast } from "sonner"
 
 const ERROR_MESSAGE = {
@@ -9,13 +11,19 @@ const ERROR_MESSAGE = {
 	[ErrorCode.FileExists]: "File already exists",
 	[ErrorCode.Internal]: "Internal application error",
 	[ErrorCode.Conflict]: "Conflict",
-	[ErrorCode.DirectoryNotFound]: "Directory not found",
-	[ErrorCode.FileNotFound]: "File not found",
 	[ErrorCode.Unauthenticated]: "Unauthenticated",
+	[ErrorCode.NotFound]: "Not found",
+	[ErrorCode.StorageQuotaExceeded]: "Storage is full",
 } as const
 
+export function isApplicationConvexError(
+	error: unknown,
+): error is ConvexError<ApplicationErrorData> {
+	return error instanceof ConvexError && isApplicationError(error.data)
+}
+
 export function formatError(error: unknown): string {
-	if (isApplicationError(error)) {
+	if (isApplicationConvexError(error)) {
 		return ERROR_MESSAGE[error.data.code]
 	}
 	if (error instanceof Error) {
@@ -25,8 +33,12 @@ export function formatError(error: unknown): string {
 }
 
 export function defaultOnError(error: unknown) {
-	console.log(error)
-	toast.error(formatError(error))
+	if (isApplicationConvexError(error)) {
+		toast.error(formatError(error))
+	} else {
+		console.error("Catastrophic error:", error)
+		toast.error("An unexpected error occurred")
+	}
 }
 
 export function withDefaultOnError(fn: (error: unknown) => void) {
diff --git a/apps/drive-web/vite.config.ts b/apps/drive-web/vite.config.ts
index b9fcc6c..313dc18 100644
--- a/apps/drive-web/vite.config.ts
+++ b/apps/drive-web/vite.config.ts
@@ -1,7 +1,7 @@
+import path from "node:path"
 import tailwindcss from "@tailwindcss/vite"
 import { TanStackRouterVite } from "@tanstack/router-plugin/vite"
 import react from "@vitejs/plugin-react"
-import path from "path"
 import { defineConfig } from "vite"
 
 export default defineConfig({
@@ -19,7 +19,7 @@ export default defineConfig({
 		},
 	},
 	optimizeDeps: {
-		include: ["convex/react", "convex-helpers"],
+		include: ["convex/react", "convex/values", "convex-helpers"],
 		// Workaround for better-auth bug: https://github.com/better-auth/better-auth/issues/4457
 		// Vite's esbuild incorrectly transpiles better-call dependency causing 'super' keyword errors
 		exclude: ["better-auth", "@convex-dev/better-auth"],
diff --git a/packages/convex/shared/error.ts b/packages/convex/shared/error.ts
index 5c49098..f33379e 100644
--- a/packages/convex/shared/error.ts
+++ b/packages/convex/shared/error.ts
@@ -1,36 +1,44 @@
 import { ConvexError } from "convex/values"
 
-export enum Code {
+export enum ErrorCode {
 	Conflict = "Conflict",
 	DirectoryExists = "DirectoryExists",
-	DirectoryNotFound = "DirectoryNotFound",
 	FileExists = "FileExists",
-	FileNotFound = "FileNotFound",
 	Internal = "Internal",
 	Unauthenticated = "Unauthenticated",
 	NotFound = "NotFound",
 	StorageQuotaExceeded = "StorageQuotaExceeded",
 }
 
-export type ApplicationErrorData = { code: Code; message?: string }
-export type ApplicationError = ConvexError<ApplicationErrorData>
+export type ApplicationErrorData = { code: ErrorCode; message?: string }
 
-export function isApplicationError(error: unknown): error is ApplicationError {
-	return error instanceof ConvexError && "code" in error.data
+export function isApplicationError(
+	error: unknown,
+): error is ApplicationErrorData {
+	return (
+		error !== null &&
+		typeof error === "object" &&
+		"code" in error &&
+		"message" in error &&
+		Object.values(ErrorCode).includes(
+			(error as { code: string }).code as ErrorCode,
+		)
+	)
 }
 
-export function create(code: Code, message?: string): ApplicationError {
-	return new ConvexError({
-		code,
-		message:
-			code === Code.Internal ? "Internal application error" : message,
-	})
-}
-
-export function createJson(code: Code, message?: string): ApplicationErrorData {
+export function createErrorData(
+	code: ErrorCode,
+	message?: string,
+): ApplicationErrorData {
 	return {
 		code,
 		message:
-			code === Code.Internal ? "Internal application error" : message,
+			code === ErrorCode.Internal
+				? "Internal application error"
+				: message,
 	}
 }
+
+export function error(data: ApplicationErrorData): never {
+	throw new ConvexError(data)
+}