Error uploading to Pavlovia

Hello, I’m trying to upload 3 versions of a self-paced reading paradigm (for counterbalancing). Oddly, two of the versions (a and b) have uploaded successfully to Pavlovia, but the third (version c) is not successful. I can run the task on my desktop successfully without any errors, but I get the following when trying to create a new project with Pavlovia:
Traceback (most recent call last):

File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\app\builder\”, line 1232, in onPavloviaSync
retVal = pavlovia_ui.syncProject(parent=self, project=self.project)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\app\pavlovia_ui\”, line 488, in syncProject
recreatorDlg = ProjectRecreator(parent=parent, project=project)
File “C:\Program Files\PsychoPy3\lib\site-packages\psychopy\app\pavlovia_ui\”, line 611, in init
1, wx.ALL | wx.ALIGN_RIGHT, 5)
wx._core.wxAssertionError: C++ assertion “!(flags & wxALIGN_RIGHT)” failed at …\src\common\sizer.cpp(2098) in wxBoxSizer::DoInsert(): Horizontal alignment flags are ignored in horizontal sizers

I’ve rewritten the task twice but I get the same error every time! The other two versions are already in Pavlovia and I just can’t seem to figure it out. Any suggestions?

(I have double checked the code, no errors, and have exported the html from the builder, but still nothing…)

Thanks in advance!!!