Compiling problem with GWT Compiler

Hi everyone,

Im having big issues with the compilation of my project, there is already a GWT Web application running. 
As a side-project I now want to make a mobile application of my already existing GWT Web application.
I already changed some widgets from GWT to mgwt and the project runs without a problem. The only thing I cannot do is compiling my project.
Errors that I get when trying to compile with the GWT Compiler:

Java heap space and Unable to read from byte cache.

I already increased the size of the arguments and I also deleted all files from the folder unitcache.

I also tried to compile my project without mgwt and it compiles without a problem. So it must be something wrong with mgwt or the way I implemented it. But I don´t think so, since I followed the Tutorials.

What could be the problem? Can somebody please help me?

Im using:

GWT 2.5.1
JRE7 32 Bit
Windows XP on a Laptop
mgwt 1.2.1

Thanks in advance.

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