@amartitegui
Maybe you haven't known, LazToApk is a tool to automate the installation and configuration of Laz4Android. If the result of LazToApk fails, you probably will fail too using Laz4Android.
Luckily you can use LAMW + Lazarus only, without Laz4Android (to be more specific - CustomDrawn widgetset). To do so, you have to use the visual components provided by LAMW only, they are the ones started with 'j' (example: jButton, jPanel, etc).
The only problem I get is building APK.
To properly configure Laz4Android (or LAMW or Lazarus) you need to:
1. Download & install Android's SDK and NDK
2. Instal Ant, Java and some others if you use Linux
3. Set the paths according to the SDK, NDK, Ant, Java you installed
4. Set compiler parameters according to the SDK, NDK you downloaded
5. Cross compile your Lazarus/FPC to support Android ARM (or/and i386)
Android's toolchain is complicated and any minor mistake mentioned above will sure to fail to produce apk. Have you done the 5 things above correctly?
I managed to understand how to configure them manually and properly to target Android both ARM and i386. I saw you use Windows, unfortunately I'm a Linux user. Maybe you can get some idea how to configure them by reading this tutorial (Linux only):
http://forum.lazarus.freepascal.org/index.php/topic,38777.msg264419.html#msg264419