diff --git a/packages/stack-server/src/app/(main)/(protected)/projects/[projectId]/use-admin-app.tsx b/packages/stack-server/src/app/(main)/(protected)/projects/[projectId]/use-admin-app.tsx
index d33e76499..4b723f690 100644
--- a/packages/stack-server/src/app/(main)/(protected)/projects/[projectId]/use-admin-app.tsx
+++ b/packages/stack-server/src/app/(main)/(protected)/projects/[projectId]/use-admin-app.tsx
@@ -2,7 +2,7 @@
 
 import React from "react";
 import { useUser } from "@stackframe/stack";
-import { throwErr } from "@stackframe/stack-shared/dist/utils/errors";
+import { StackAssertionError, throwErr } from "@stackframe/stack-shared/dist/utils/errors";
 import { cacheFunction } from "@stackframe/stack-shared/dist/utils/caches";
 import { CurrentUser, StackAdminApp } from "@stackframe/stack";
 
@@ -39,7 +39,7 @@ export function AdminAppProvider(props: { projectId: string, children: React.Rea
 export function useAdminApp() {
   const stackAdminApp = React.useContext(StackAdminAppContext);
   if (!stackAdminApp) {
-    throw new Error("useAdminApp must be used within a AdminInterfaceProvider");
+    throw new StackAssertionError("useAdminApp must be used within an AdminInterfaceProvider");
   }
 
   return stackAdminApp;
diff --git a/packages/stack-server/src/app/api/v1/auth/callback/[provider]/route.tsx b/packages/stack-server/src/app/api/v1/auth/callback/[provider]/route.tsx
index 6155a9fc3..1c7c30333 100644
--- a/packages/stack-server/src/app/api/v1/auth/callback/[provider]/route.tsx
+++ b/packages/stack-server/src/app/api/v1/auth/callback/[provider]/route.tsx
@@ -45,7 +45,7 @@ export const GET = deprecatedSmartRouteHandler(async (req: NextRequest, options:
 
   const cookie = cookies().get("stack-oauth");
   if (!cookie) {
-    throw new Error("stack-oauth cookie not found");
+    throw new StatusError(StatusError.BadRequest, "stack-oauth cookie not found");
   }
 
   let decoded: Awaited<ReturnType<typeof jwtSchema.validate>>;
diff --git a/packages/stack-server/src/app/api/v1/auth/password-reset/route.tsx b/packages/stack-server/src/app/api/v1/auth/password-reset/route.tsx
index 0d106e1fb..14bcae2df 100644
--- a/packages/stack-server/src/app/api/v1/auth/password-reset/route.tsx
+++ b/packages/stack-server/src/app/api/v1/auth/password-reset/route.tsx
@@ -5,6 +5,7 @@ import { deprecatedSmartRouteHandler } from "@/route-handlers/smart-route-handle
 import { deprecatedParseRequest } from "@/route-handlers/smart-request";
 import { hashPassword } from "@stackframe/stack-shared/dist/utils/password";
 import { KnownErrors } from "@stackframe/stack-shared";
+import { StatusError } from "@stackframe/stack-shared/dist/utils/errors";
 
 const postSchema = yup.object({
   body: yup.object({
@@ -40,7 +41,7 @@ export const POST = deprecatedSmartRouteHandler(async (req: NextRequest) => {
   }
 
   if (!password) {
-    throw new Error("Password is required when onlyVerify is false");
+    throw new StatusError(StatusError.BadRequest, "Password is required when onlyVerify is false");
   }
   
   await prismaClient.projectUser.update({
diff --git a/packages/stack-server/src/app/api/v1/auth/signup/route.tsx b/packages/stack-server/src/app/api/v1/auth/signup/route.tsx
index e39651201..b91a7423d 100644
--- a/packages/stack-server/src/app/api/v1/auth/signup/route.tsx
+++ b/packages/stack-server/src/app/api/v1/auth/signup/route.tsx
@@ -11,7 +11,7 @@ import { getProject } from "@/lib/projects";
 import { validateUrl } from "@/utils/url";
 import { getPasswordError } from "@stackframe/stack-shared/dist/helpers/password";
 import { getApiKeySet, publishableClientKeyHeaderSchema } from "@/lib/api-keys";
-import { StatusError, captureError } from "@stackframe/stack-shared/dist/utils/errors";
+import { StackAssertionError, StatusError, captureError } from "@stackframe/stack-shared/dist/utils/errors";
 import { KnownErrors } from "@stackframe/stack-shared";
 import { createTeamOnSignUp } from "@/lib/users";
 
@@ -51,7 +51,7 @@ export const POST = deprecatedSmartRouteHandler(async (req: NextRequest) => {
 
   const project = await getProject(projectId);
   if (!project) {
-    throw new Error("Project not found"); // This should never happen, make typescript happy
+    throw new StackAssertionError("Project not found. This should never happen"); // This should never happen, make typescript happy
   }
 
   if (!project.evaluatedConfig.credentialEnabled) {
diff --git a/packages/stack-server/src/app/api/v1/projects/[projectId]/route.tsx b/packages/stack-server/src/app/api/v1/projects/[projectId]/route.tsx
index 2f9e9cc45..6ca2e260c 100644
--- a/packages/stack-server/src/app/api/v1/projects/[projectId]/route.tsx
+++ b/packages/stack-server/src/app/api/v1/projects/[projectId]/route.tsx
@@ -1,6 +1,6 @@
 import { NextRequest, NextResponse } from "next/server";
 import * as yup from "yup";
-import { StatusError } from "@stackframe/stack-shared/dist/utils/errors";
+import { StackAssertionError, StatusError } from "@stackframe/stack-shared/dist/utils/errors";
 import { deprecatedSmartRouteHandler } from "@/route-handlers/smart-route-handler";
 import { deprecatedParseRequest } from "@/route-handlers/smart-request";
 import { checkApiKeySet, publishableClientKeyHeaderSchema, superSecretAdminKeyHeaderSchema } from "@/lib/api-keys";
@@ -50,7 +50,7 @@ const handler = deprecatedSmartRouteHandler(async (req: NextRequest, options: {
 
     const project = await getProject(projectId);
     if (!project) {
-      throw new Error("Project not found but the API key was valid? Something weird happened");
+      throw new StackAssertionError("Project not found but the API key was valid? Something weird happened");
     }
     const clientProject: ClientProjectJson = {
       id: project.id,
diff --git a/packages/stack-server/src/components/ui/form.tsx b/packages/stack-server/src/components/ui/form.tsx
index 6ab1e72bd..7bcfc4efa 100644
--- a/packages/stack-server/src/components/ui/form.tsx
+++ b/packages/stack-server/src/components/ui/form.tsx
@@ -12,6 +12,7 @@ import {
 
 import { cn } from "@/lib/utils";
 import { Label, SpanLabel } from "@/components/ui/label";
+import { StackAssertionError } from "@stackframe/stack-shared/dist/utils/errors";
 
 const Form = FormProvider;
 
@@ -47,7 +48,7 @@ const useFormField = () => {
   const fieldState = getFieldState(fieldContext.name, formState);
 
   if (!fieldContext) {
-    throw new Error("useFormField should be used within <FormField>");
+    throw new StackAssertionError("useFormField should be used within <FormField>");
   }
 
   const { id } = itemContext;