ClassNotFoundException: Didn't find class

I tried to make a custom keyboard using this tutorial on tuts+, but when I run it and change the keyboard I get the error:

java.lang.RuntimeException: Unable to instantiate service com.ginso.simplekeyboard.SimpleIME: java.lang.ClassNotFoundException: Didn't find class "com.ginso.simplekeyboard.SimpleIME" on path: DexPathList[[zip file "/data/app/com.ginso.simplekeyboard-2/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]

I tried to remove the dot in the manifest in <service android:name=".SimpleIME" />. I also tried the code for manifest someone posted in the comments. But nothing changed. What am I doing wrong?

Edit:
SimpleIME is located in the standard package.

via Chebli Mohamed