The back-end build process is the final stage of converting the ZBasic code to AVR executable code for native mode ZX devices. Normally, this phase will complete without error but there are a number of things that can go awry. To determine why it's happening we need more information.
One way to get the additional information is to add the
--verbose option to your project file. You do this by selecting the "Open Project File" entry from the Options menu of the IDE. Your project file will appear in one of the tabbed windows. Add the following line near the the top of the project file:
Now, when you press F7 to compile the project you'll get a stream of command lines and other information appearing in the Output window of the IDE. If an error does occur in the back-end build process, it will be visible in that message stream. The entire block of text can be selected in the Output window using the mouse and copied to the clipboard using ctrl-C. Then, you can paste it in the edit box (surrounded by "code" tags) in a forum post or email it to us for analysis. The --verbose option can be left in the project file but commented out by inserting a pound sign as the first character of the line.
Depending on what is discovered in the verbose output, we may ask you to add other options to the project file so that the intermediate files are saved and then can be examined.