So below is the controller from which i am getting the error message as : “Cannot invoke “org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder.getObject()” because “this.authenticationManagerBuilder” is null

open class UserJWTController(
    private val tokenProvider: TokenProvider,
    private val authenticationManagerBuilder: AuthenticationManagerBuilder
) {
   
    @PostMapping("/authenticate")
    fun authorize(@RequestBody loginVM: @Valid LoginVM?): ResponseEntity<JWTToken> {
        // Create an authentication token using the provided username and password
        val authenticationToken =
            UsernamePasswordAuthenticationToken(loginVM!!.username, loginVM.password)

        // Authenticate the user
        val authentication = authenticationManagerBuilder.getObject().authenticate(authenticationToken)
        SecurityContextHolder.getContext().authentication = authentication

        response
        return getJwtTokenResponseEntity(tokenProvider.createToken(authentication))
    }

    // Helper method to create a ResponseEntity containing the JWT token
    private fun getJwtTokenResponseEntity(token: String): ResponseEntity<JWTToken> {
        return ResponseEntity.ok(JWTToken(token))
    }
}

data class LoginVM(
    val username: String,
    val password: String
)

response
data class JWTToken(val idToken: String)