[Grbl_Esp32 Issue#387] Problems Compiling Firmware

Please answer the following questions:

Have you read the wiki regarding how to compile? Yes

What version of the Arduino IDE are you using? 1.8.13

What version (commit date) of the Arduino core for the ESP32 are you using? 1.0.4

Are you using the master branch of Grbl_ESP32? Yes

Have you made any edits or configuration changes (list them) to the firmware? No
Download 28.04.2020
I have problems with the current version when compiling today.
The previous version can be compiled.

Please paste the compiler error text here:

In file included from sketch/grbl.h:56:0,
from sketch/serial.h:24,
from sketch/grbl.h:55,
from sketch/report.h:24,
from sketch/grbl.h:54,
from sketch/motion_control.h:30,
from sketch/grbl.h:50,
from sketch/grbl_eeprom.h:24,
from sketch/grbl.h:47,
from sketch/system.h:23,
from sketch/grbl.h:43,
from sketch/settings.h:28,
from sketch/grbl.h:42,
from sketch/tdef.h:4,
from sketch/grbl.h:39,
from /home/juergn/Arduino/GrblEsp32-master/GrblEsp32/Grbl_Esp32.ino:21:
sketch/tools/SpindleClass.h:41:18: fatal error: grbl.h: No such file or directory
compilation terminated.
exit status 1
Fehler beim Kompilieren für das Board ESP32 Dev Module.