Error on executing the Arduino IDE on Manjaro Linux 18.0.1

Using Arduino IDE 1.x
1

Hello everyone! I'm using the Manjaro 18.0.1 Deepin on my notebook and I'm having some errors to run the Arduino IDE:

(java:1532): Gtk-WARNING **: 17:58:21.115: Unable to locate theme engine in module_path: "adwaita",

(java:1532): Gtk-WARNING **: 17:58:21.116: Unable to locate theme engine in module_path: "adwaita",

(java:1532): Gtk-WARNING **: 17:58:21.120: Unable to locate theme engine in module_path: "murrine",

(java:1532): Gtk-WARNING **: 17:58:21.121: Unable to locate theme engine in module_path: "murrine",

(java:1532): Gtk-WARNING **: 17:58:21.121: Unable to locate theme engine in module_path: "murrine",

(java:1532): Gtk-WARNING **: 17:58:21.122: Unable to locate theme engine in module_path: "murrine",

(java:1532): Gtk-WARNING **: 17:58:21.123: Unable to locate theme engine in module_path: "murrine",

(java:1532): Gtk-WARNING **: 17:58:21.123: Unable to locate theme engine in module_path: "murrine",

(java:1532): Gtk-WARNING **: 17:58:21.123: Unable to locate theme engine in module_path: "murrine",

(java:1532): Gtk-WARNING **: 17:58:21.124: Unable to locate theme engine in module_path: "murrine",

(java:1532): Gtk-WARNING **: 17:58:21.124: Unable to locate theme engine in module_path: "murrine",

(java:1532): Gtk-WARNING **: 17:58:21.124: Unable to locate theme engine in module_path: "murrine",

(java:1532): Gtk-WARNING **: 17:58:21.124: Unable to locate theme engine in module_path: "murrine",
java.lang.NullPointerException
	at processing.app.BaseNoGui.onBoardOrPortChange(BaseNoGui.java:679)
	at processing.app.Base.onBoardOrPortChange(Base.java:1312)
	at processing.app.Base.<init>(Base.java:282)
	at processing.app.Base.main(Base.java:151)

I've already installed the gtk-engine package but it doesn't seem to work.

Can someone help me fix this, please?

2

How did you install the IDE?

Be sure to always install it from the download on the Arduino website, not from a package manager - the package manager versions are almost always obsolete, and have often been modified by people who don't know anything about arduino, in ways that result in it not working correctly.

3

I've installed using the yaourt package manager, I'll try to install it from the official site. Thanks for the help!