Just take a look at this comment on the Use-your-Drive product page.
Hi there,
I am the author of Use-your-Drive and the issue that you are describing is caused by the fact that the Simple Calendar plugin is loading a newer Google API library (V3) than Use-your-Drive. Both plugins are trying to load the Google API library, and due to the plugin order, the Simple Calendar is just loading its library before Use-your-Drive.
I will try to update Use-your-Drive this week to the new library to solve this compatibility issue. In the mean time, you can solve this issue by uploading the following file to the /vendor/google/apiclient/src/Google/Service folder of the Simple Calendar plugin: Drive.php (154kb, Checksum: 2e1bc7e62f84f160296880aad0e5fd5b9d3d696a)
