The configuration of the app service exceeds the limits of the trial subscription. To resolve the issue, you can either change the selection in your app service configuration or upgrade to a paid subscription.
The limitations for app services on trial subscriptions can be seen at subscription service limits.
The trial subscription is limited to shared app service plans with a maximum memory allocation of 1GB (1024 MB), the S1 plan is not a shared plan and has a memory allocation of 1.75GB, change the app service selection to F1 or D1 which are both within the trial limitations.
You can review the documentation for the S1 plan, and the F1 and D1 plans for more information.