Error while building project on Linux, related to WINE paths I think?

[dragos240]

I'm on the next branch and I keep getting errors related to paths, but they're in Windows' backslash format and without a drive letter, so I think it's trying to use absolute paths for some reason. If I run the command through the UI, I get this:

That path does indeed exist, but I thought it might need Z: to access the Linux filesystem where my project lives, so I looked at the terminal output when building and it spat this out:

2026-01-13 10:52:33,837 project.py:478 MainThread INFO Compiling project /home/nat/repos/Mi-Create/src/Osaka project/Osaka/Osaka.fprj
['compiler/compile.exe', '-b', '\\home\\nat\\repos\\Mi-Create\\src\\Osaka project\\Osaka\\Osaka.fprj', '\\home\\nat\\repos\\Mi-Create\\src\\Osaka project\\Osaka\\output', 'circle_nl.bin', '1461256429']
2026-01-13 10:52:37,859 main.py:2161 MainThread DEBUG ['Loading \\home\\nat\\repos\\Mi-Create\\src\\Osaka project\\Osaka\\Osaka.fprj\r\n', "Error: unable to open image '\\home\\nat\\repos\\Mi-Create\\src\\Osaka project\\Osaka\\images\\': No such file or directory @ error/blob.c/OpenBlob/3315\r\n============ Errors: 1 ============\r\n"]
2026-01-13 10:52:37,859 main.py:2322 MainThread ERROR Failed to build watchface! Error: unable to open image '\home\nat\repos\Mi-Create\src\Osaka project\Osaka\images\': No such file or directory @ error/blob.c/OpenBlob/3315
2026-01-13 10:52:37,859 main.py:2323 MainThread ERROR Detailed output: 
2026-01-13 10:52:37,860 main.py:2324 MainThread ERROR Error dump: 
projects: {'/home/nat/repos/Mi-Create/src/Osaka project/Osaka': {'canvas': <widgets.canvas.Canvas object at 0x7f2aa0bdba70>,
                                                       'hasFileChanged': False,
                                                       'project': <utils.project.FprjProject object at 0x7f2aa0ba6cf0>,
                                                       'type': 'workspace'}}
------------------------
settings: {'Canvas': {'Antialiasing': {'string': 'Antialiasing',
                             'type': 'bool',
                             'value': True},
            'ClipDeviceShape': {'string': 'Clip to Device Shape',
                                'type': 'bool',
                                'value': False},
            'Interpolation': {'options': ['Bilinear', 'Nearest Neighbour'],
                              'string': 'Image Interpolation',
                              'type': 'list',
                              'value': 'Bilinear'},
            'ShowDeviceOutline': {'changeState': ['ClipDeviceShape',
                                                  'disabled',
                                                  False],
                                  'string': 'Show Device Outline',
                                  'type': 'bool',
                                  'value': True},
            'Snap': {'string': 'Snap to Guides',
                     'type': 'bool',
                     'value': True}},
 'General': {'CheckUpdate': {'string': 'Check for Updates',
                             'type': 'bool',
                             'value': True},
             'Language': {'options': ['Español',
                                      'Русский',
                                      'Portuguese',
                                      'Italiano',
                                      '简体中文',
                                      'Українська',
                                      'English'],
                          'string': 'Language',
                          'type': 'list',
                          'value': 'English'},
             'Theme': {'options': ['Default Dark', 'Default Light'],
                       'string': 'Theme',
                       'type': 'list',
                       'value': 'Default Dark'}}}

According to that log, the command it tried to run was compiler/compile.exe -b \\home\\nat\\repos\\Mi-Create\\src\\Osaka project\\Osaka\\Osaka.fprj \\home\\nat\\repos\\Mi-Create\\src\\Osaka project\\Osaka\\output circle_nl.bin 1461256429. So next, I ran that exact command in my terminal with wine and I got this:
log.txt

The error being an exception:

System.FormatException: Input string was not in a correct format.
  at System.Number.ThrowOverflowOrFormatException (System.Boolean overflow, System.String overflowResourceKey) [0x0001a] in <7b313c6e3f2c40498605ece484863e6a>:0 
  at System.Number.ParseInt32 (System.ReadOnlySpan`1[T] value, System.Globalization.NumberStyles styles, System.Globalization.NumberFormatInfo info) [0x00016] in <7b313c6e3f2c40498605ece484863e6a>:0 
  at System.Int32.Parse (System.String s) [0x00016] in <7b313c6e3f2c40498605ece484863e6a>:0 
  at MiWatchCompiler.Program.MainBody (System.String[] args) [0x00041] in <db00ff02616d444a803ed4944ad599f0>:0 
  at MiWatchCompiler.Program.Main (System.String[] args) [0x00016] in <db00ff02616d444a803ed4944ad599f0>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.FormatException: Input string was not in a correct format.
  at System.Number.ThrowOverflowOrFormatException (System.Boolean overflow, System.String overflowResourceKey) [0x0001a] in <7b313c6e3f2c40498605ece484863e6a>:0 
  at System.Number.ParseInt32 (System.ReadOnlySpan`1[T] value, System.Globalization.NumberStyles styles, System.Globalization.NumberFormatInfo info) [0x00016] in <7b313c6e3f2c40498605ece484863e6a>:0 
  at System.Int32.Parse (System.String s) [0x00016] in <7b313c6e3f2c40498605ece484863e6a>:0 
  at MiWatchCompiler.Program.MainBody (System.String[] args) [0x00041] in <db00ff02616d444a803ed4944ad599f0>:0 

It doesn't specify what the string is, so I can't go any further

[dragos240]

Oh, and I did try running this with Linux paths: wine ../../compiler/compile.exe -b /home/nat/repos/Mi-Create/src/Osaka project/Osaka/Osaka.fprj output /home/nat/repos/Mi-Create/src/Osaka project/Osaka/output 1461256429, but I get this:

Error: Destination array was not long enough. Check destIndex and length, and the array's lower bounds
Parameter name: destinationArray

[dragos240]

So it seems this is not a Linux problem specifically, but the editor doesn't give you warnings that would make it easier to spot problems when building. Like for example, if there are empty images in an image list, that will cause the build to fail. Making those red or doing a check before build would make this way easier

[ooflet]

Yeah, error checking is planned with the redesign. Have imagelists and digitalnumber properties been working well for you? There are some problems with changing the index of imagelist entries.

[dragos240]

Well, I haven't gotten a successfully built watch face to flash onto my watch. It either doesn't show up or it crashes the watch and reboots into a working watch face. I'm really not sure what I'm doing wrong.

[ooflet]

If you're using the latest firmware version for the Mi Band 8, the watch no longer accepts custom watch faces. Try downgrading to 1.3.176 which is the version I run on my band: https://drive.google.com/file/d/1WFrQ-Tzdw5k54XnqfBzG_ipkOBLuSF2e/view?usp=sharing. Because you have the Mi Band 8, please be very careful with what watchfaces you upload to it, the recovery on the watch is bugged and can't restore the original factory firmware.

[dragos240]

I have not updated to the latest firmware. I use the firmware that came with my device and didn't update it specifically for that reason.

As for danger in flashing, what should I do to make sure it's safe to flash?