Mockery error in testing mode (#118)

* mockery error in testing mode

* Update docs/faq_troubleshooting.md

Co-authored-by: Martin Stone <[email protected]>

---------

Co-authored-by: Martin Stone <[email protected]>

Author: ildyria

docs/faq_installation.md

@@ -74,8 +74,6 @@ However, if you want to be able to update your Lychee installation with a click
 As far as I know, the minimum set of directories that need to be http-writable is as follows:
 ```
 storage/
-storage/
-storage/
 public/uploads/small
 public/uploads/big
 public/uploads/thumb

docs/faq_troubleshooting.md

@@ -26,6 +26,13 @@ This will ensure that the paths and routes are correctly followed.
 
 > {note} Note that the `serve` command should only be used for testing and debuging. It should not be used on a production server.
 
+### I have an error 500, it says 'Class "Mockery" not found', what can I do?
+
+This is because your `APP_ENV` is set to `testing` and you are using production dependencies.
+Lychee is trying to mock the requests for test purposes.
+
+To resolve the issue, edit the `.env` file and set `APP_ENV` to something other than `testing`, for example `APP_ENV=production`.
+
 ### I have an error 500, what can I do?
 
 Edit the `.env` file and set `APP_DEBUG` to `true`, this will allow the errors to be displayed with the trace.