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To resolve the issue of an outdated optimize dependency error when using the vue toastification library for notifications, you need to follow these steps:

Upgrade the optimize dependency: Go to your project's package.json file and find the optimize dependency in the dependencies section. If the version is outdated, upgrade it to the latest version.
Clear the cache: Clear the cache of your project using the following commands:

npm cache clean --force
yarn cache clean

Reinstall the dependencies: Once you have upgraded the optimize dependency and cleared the cache, run the following command to reinstall your project's dependencies:

npm install
yarn install

Restart your development server: Stop your development server and start it again using the following command:

npm run serve
yarn serve

After following these steps, the outdated optimize dependency error should be resolved and you should be able to use the vue toastification library for notifications without any issues.