Hi Mariano. Thanks for this. I'm new to Pharo and have been away from Smalltalk for several years (way too long), so right now I am not ready to start debugging the code; perhaps I will return to this when I have recovered my "Smalltalk legs" :) I had hoped someone more in touch with the Pharo project would be able to fix this. Meanwhile, the point I want to emphasise is that this error shows up for anyone working through the Pharo By Example book. Right from the start, the book advises the reader to use a different image file from the quick start one provided with Pharo. Doing this, the reader will immediately run into the "Error:invalid utf8 input detected." problem. This could be enough to put some people off the idea of learning Smalltalk, which I am sure we all want to avoid. Even if they persevere, the impression this gives if that either Pharo is a bit flakey or the PBE book is at fault, or the PBE.image file is bad. Or all of these! As an aside, I would very much like to be able to contribute errata notices and suggestions for improved wording for the PBE book. I have ordered the hard-copy from Lulu.com and will markup any errors and clarifications as I progress through the book. Does anyone know if I can log errata etc online somewhere? --Thomas. -- View this message in context: http://forum.world.st/Error-invalid-utf8-input-detected-tp2068483p2266740.ht... Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.