It doesn't compile and I don't know why

First up: The arduino program has a small region at the bottom where it shows error messages in red text. Unfortunately it usually scrolls past the first error message and only shows you the last part, which is not very helpful. Make the error region larger and scroll up to find the first error message. Read on to learn what usually causes the errors, and how to find so they can be corrected.

If you see this error: #error Tools->DOSFS should be set to SDCARD (SPI) Go to the Tools menu, find DOSFS and set it to "SDCARD (SPI)" and try again.

If you see a lot of red text compile errors, don't be discouraged thinking there's a lot of things wrong. Usually, just the first error shown is the actual problem, and all of the following messages are just a result of a cascade effect from the problem. The most common errors are in the presets section of the config file (my_saber.h for example) where edits to presets have occured. It's quite easy to make a typo, specifically leaving out a code punctuation (comma, < or >, a parenthesis, a bracket etc...). Many times styles can be copied from the [Style Editor] or elsewhere and pasted in the config file without having a comma added, or the whole line to be replaced was selected, including the comma, and then pasted over. Each blade style must be followed by a comma, unless the preset description at the end is being omitted, leaving the blade style as the last element, where it then just gets followed by a closing bracket comma }, Each style's arguments must open with < and close with >. Again, missing just one of these punctuations will cause the compile to fail. This is easy to miss once looking at multiple nested templates, such as:

AudioFlicker<Blue,Rgb<128,0,128>> is sometimes left as just AudioFlicker<Blue,Rgb<128,0,128>

It looks complete at a quick glance. However, the Rgb has it's own closing > but AudioFlicker also needs one, and visually it's easy to miss until you get very used to seeing it.

The second most common issue is a mismatch of number of blades defined in the CONFIG_TOP section and the number of blade styles contained in the preset(s). Each LED wired to an LED pin on the board counts as a "blade", even if it's a single accent LED. If you have 1 main blade and 2 accent LEDs, 3 "blades" must be defined with #define NUM_BLADES 3, and all of the presets must contain 3 complete blade styles.

The error message in Arduino gives the best clue as to where the problem exists in the form of a line number of the config file causing the problem. For this reason, it is highly suggested to use a text editor that uses line numbering for troubleshooting the problem with the config file. In the following example error message, Just before the first occurance of the word "error" is the line number, and there's a carrot symbol pointing up to the issue. They're bolded below::

In file included from /HardDrive/Lightsabers/ProffieOS/ProffieOS.ino:631:0: /var/arduino_build_915026/sketch/config/default_proffieboard_config.h:47:5: error: expected '}' before >'StyleNormalPtr' StyleNormalPtr<WHITE, RED, 300, 800, RED>(), "white"}, ^

allafter ittry just pasting it into google and see what it tells you. There is a good chance that if someone else had the same problem, google will find the solution for you.

If that doesn't help, go here: http://therebelarmory.com/thread/10207/proffieboard-newbie-thread and post your config file and complete error message, and someone will help you figure out what the problem is.