Building Fire app (error)

[liudger]

I am not able to build fire anymore :(
I did put the file 'bastring.h' in the proper folder, but when i build the app I get many internal errors like this one

File: pbxindex/PBXProjectIndex.m
Line: 2629
Object: <PBXProjectIndex:0x00051e70>
Method: indexOfSourceFileSucceeded

Assertion failed: NSCountMapTable(_suspendedFiles) == 0

How can I resolve this problem, please help