Build error compiling ExtJS app using Sencha Cmd v5.1.3.61

Question

My build is failing in my ExtJS 5 project - I am using Ubuntu 15 desktop version.

[ERR] com.sencha.exceptions.ExProcess: Failed creating background process
[ERR] at com.sencha.command.plugin.PluginManager.executeRe
[ERR] verseFirst(PluginManager.java:134)

Answer 1

Older versions of Sencha Cmd were dependent on Ruby 1.9.3 or below. It's likely this is the cause as Ruby is being used to compile Sass themes and the [INF] lines immediately above the error indicate that this step is where the build process is failing.

You can verify which version you currently have by running ruby -v in your terminal window. If you'd rather not downgrade Ruby - you could instead try upgrading your version of Sencha Cmd as later versions were patched to work with Ruby 2.

If you do try to upgrade Cmd, the build might complain about differing project and compiler versions - you can run the following inside your existing ExtJS project directory (do a backup first) to upgrade the build configuration independently of the framework:

sencha app upgrade --noframework

Answer 2

Thanks all, I uninstalled sencha cmd 5.1.1 and installed sencha cmd 6, then it worked perfectly, thanks for the support.