too many compiles performed recently. Try again

although changing the minifier setting should work too

I did that... and may have had this side effect:

In Project, I selected No Minification for Module Minification (for Minification it was already set to No Minification), and it did reset / clear the Sandbox directory setting in Communication of the WEB IDE... (added clarification that the Files were not cleared, just the setting in Web IDE).

Is that possible?

Sending code to the board with a reset / cleard / empty Sandbox directory and modules to be expected to found in /sandbox/modules (too), the console shows:

>echo(0);
ERROR: Unable to mount SD card : NOT_READY
WARNING: Module "XYZMODULE" not found
Uncaught Error: Field or method does not already exist, and can't create it on undefined
 at line 1 col 30
var v = require("XYZMODULE").connect(.....