[Lazarus] Updating .po files failed error on Laz x86 trunk

[Reinier Olislagers]

fpcup, laz x86 r42110, fpc trunk x86, windows 7 64 bit.

Trying to compile a demo program, the LCL is recompiled (probably
because the demo program is a release build while I had built the LCL
with debug).

Now I get this:
Error: updating po files failed for package LCLBase 1.0.1

How can I fix this?

Thanks,
Reinier