I Came across an interesting issue when upgrading servers from Easy Apache 3 to Easy Apache 4.
I got the following error:
This system is currently building an EasyApache 3 stack. Please wait for that process to finish before migrating to EasyApache 4
If you find that Easy Apache 3 is NOT currently compiling a new Apache stack then you can check if the following file exists:
Then remove it and try again 🙂