Question: i am currenty working on a python fastapi project for university. Every time i run my authorization dependencies i get the following error: ERROR: Exception in ASGI application Traceback (most recent call last): File "C:\Python39\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 366, in run_asgi result = await app(self.scope, self.receive, self.send) File "C:\Python39\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 75, in __call__ return await self.app(scope, receive, send) File "C:\Python39\lib\site-packages\fastapi\applications.py", line 208, in __call__ await super().__call__(scope, receive, send) File "C:\Python39\lib\site-packages\starlette\applications.py", line 112, in __call__ await self.middleware_stack(scope, receive, send) File "C:\Python39\lib\site-packages\starlette\middleware\errors.py", line 181, in __call__ raise exc File "C:\Python39\lib\site-packages\starlette\middleware\errors.py", line 159, in __call__ await self.app(scope, receive, _send) File "C:\Python39\lib\site-packages\starlette\exceptions.py", line 82, in __call__ raise exc File "C:\Python39\lib\site-packages\starlette\exceptions.py", line 71, in __call__ await self.app(scope, receive, sender) File "C:\Python39\lib\site-packages\starlette\routing.py", line 656, in __call__ await route.handle(scope, receive, send) File "C:\Python39\lib\site-packages\starlette\routing.py", line 259, in handle await self.app(scope, receive, send) File "C:\Python39\lib\site-packages\starlette\routing.py", line 61, in app response = await func(request) File "C:\Python39\lib\site-packages\fastapi\routing.py", line 216, in app solved_result = await solve_dependencies( File "C:\Python39\lib\site-packages\fastapi\dependencies\utils.py", line 496, in solve_dependencies solved_result = await solve_dependencies( File "C:\Python39\lib\site-packages\fastapi\dependencies\utils.py", line 525, in solve_dependencies solved = await call(**sub_values) File "e:\Dev\Ottomize\Ottomize\backend\app\auth_handler.py", line 60, in get_current_user token_data = schemas.TokenData(username) File "pydantic\main.py", line 322, in pydantic.main.BaseModel.__init__ TypeError: __init__() takes exactly 1 positional argument (2 given)  Here is my relevant code: FAST API Endpoint: @app.get("/user/current/info/", response_model=schemas.User) async def user_info(current_user: schemas.User = Depends(auth_handler.get_current_active_user)): return current_user  Used functions in my auth_handler.py: from fastapi.security import OAuth2PasswordBearer from jose import JWTError, jwt from passlib.context import CryptContext from datetime import datetime, timedelta from typing import Optional from fastapi import Depends, HTTPException, status from . import crud, schemas, config, database oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token") pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto") #gets user out of db def get_user(username: str): db = database.SessionLocal() return crud.get_user_by_username(db, username) #gets current user async def get_current_user(token: str = Depends(oauth2_scheme)): credentials_exception = HTTPException( status_code=status.HTTP_401_UNAUTHORIZED, detail="Could not validate credentials", headers={"WWW-Authenticate": "Bearer"}, ) try: payload = jwt.decode(token, config.SECRET_KEY, algorithms=[config.ALGORITHM]) username: str = payload.get("sub") if username is None: raise credentials_exception token_data = schemas.TokenData(username) except JWTError: raise credentials_exception user = get_user(token_data.username) if user is None: raise credentials_exception return user #gets current user if active async def get_current_active_user(current_user: schemas.User = Depends(get_current_user)): if current_user.disabled: raise HTTPException(status_code=400, detail="Inactive user") return current_user  Used functions in my crud.py: def get_user_by_username(db: Session, username: str): return db.query(models.User).filter(models.User.username == username).first()  Used sqlalchemy models: from sqlalchemy import Boolean, Column, ForeignKey, Integer, String from sqlalchemy.orm import relationship from .database import Base class User(Base): __tablename__ = "user" id = Column(Integer, primary_key=True, index=True) username = Column(String(100), unique=True, index=True) mail = Column(String(100), unique=True, index=True) hashed_password = Column(String(100)) is_active = Column(Boolean, default=True) permissions = relationship("Permission", back_populates="user") class Permission(Base): __tablename__ = "permission" id = Column(Integer, primary_key=True, index=True) name = Column(String(100)) user_id = Column(Integer, ForeignKey("user.id")) user = relationship("User", back_populates="permissions")  Used pydantic models: from typing import List, Optional from pydantic import BaseModel #Define Datatype Token class Token(BaseModel): access_token: str token_type: str #Define Datatype TokenData class TokenData(BaseModel): username: str class Config: orm_mode = True #Define Datatype User class User(BaseModel): id: int username: str mail: str is_active: Optional[bool] permissions: List[Permission] = [] class Config: orm_mode = True  I am really new to fastapi and python in general and would really appreciate help!

Answer: You have to give Pydantic which key you are providing a value for: token_data = schemas.TokenData(username=username)  Otherwise Pydantic has no idea that the variable username from the parent scope should be assigned to the username property in the schema.