The following list are error messages should help you to find the reason and take corrective actions. Please note, the list is still incomplete.
Details: You want to create multiple files for your design. wxGlade expects an output directory in such case, but the given output path isn't a existing directory.
Corrective Action: Create the missing directory or select an existing output directory.
Corrective Action: Choose a writable output directory.
Details: You want to write your design into a single file. wxGalde expects an output filename, but the given output path is a directory.
Corrective Action: Choose a file instead of a directory.
Details: You want to create multiple files for your design. wxGlade expects an output directory in such case, but the given output path isn't a directory.
Corrective Action: Choose a output directory.
Details: The current design uses characters that can't converted to the encoding selected for the source code file.
Corrective Action: Choose a design encoding that supports the listed characters also.
Details: There is no Lisp support for the selected version of wxWidgets
Corrective Action: Create the code for an older wxWidget version.
Details: You want to create multiple XRC files for your design. This option isn't supported by wxGlade.
Corrective Action: Select the “Single file” option to store the whole design in one XRC file.
Details: You've selected a template as input file to generate source code from.
Corrective Action: Use a design file instead of a template.
Details: The code generators for the given language hasn't been loaded.
Corrective Action: That's probably a bug in wxGlade. Please check the log file and file a bug report. See the section called “How to Report a Bug” for more details.
Details: The file encoding set within the design doesn't match the encoding used within the source file. Thereby the source file can't be loaded.
Corrective Action: Check the encoding selected in your design and the encoding of your source file. Change the design encoding to match source files encoding.