i am getiing this error:
Error: [GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent: [400 ] API key not valid. Please pass a valid API key.

here is gemini-ai.ts code:

import { GoogleGenerativeAI } from "@google/generative-ai";   const apiKey = process.env.GEMINI_API_KEY as string ;  const genAI = new GoogleGenerativeAI(apiKey);  const model = genAI.getGenerativeModel({   model: "gemini-1.5-flash", });  const generationConfig = {   temperature: 1,   topP: 0.95,   topK: 64,   maxOutputTokens: 8192,   responseMimeType: "text/plain", };  export const chatSession = model.startChat({   generationConfig: generationConfig,   history: [], }); .

i think problem is related to environment variable.