[rules-users] Error on Build Package Click

[paco]

I got the following error when I tryed to build the default sample repository
after starting guvnor the first time. 
I then tried to build my own package, and got the same error:
 
	400 Sorry, a technical error occurred. Please contact a system
administrator.

Service method 'public abstract org.drools.guvnor.client.rpc.BuilderResult
org.drools.guvnor.client.rpc.PackageService.buildPackage
(java.lang.String,boolean,java.lang.String,java.lang.String,java.lang.String,boolean,java.lang.String,
java.lang.String,boolean,java.lang.String)
throws com.google.gwt.user.client.rpc.SerializationException' threw an
unexpected exception: [Error: illegal escape sequence: .] [Near : {...
".aaaa.bbbb.\.[1-4]" ....}] ^ [Line: 1, Column: 22] [Error: illegal escape
sequence: .] [Near : {... ".oooo.ppp\.[1-4]" ....}] ^ [Line: 1, Column: 22]

Please 
Suggest
Thanks

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