"Error reference to invalid character number at line 714"??

I saved my project earlier in the week, however when I reopened it, I got: ""Error reference to invalid character number at line 714.

I am running windows 10 and here is the text file:

<?xml version="1.0" standalone="no" ?>
<!DOCTYPE project PUBLIC "-//audacityproject-1.3.0//DTD//EN" "http://audacity.sourceforge.net/xml/audacityproject-1.3.0.dtd" >
<project xmlns="http://audacity.sourceforge.net/xml/" projname="Diamonds On Wrist_data" version="1.3.0" audacityversion="2.1.2" sel0="68.4178980173" sel1="68.4178980173" vpos="2720" h="51.9269764521" zoom="57.9106507919" rate="44100.0" snapto="off" selectionformat="hh:mm:ss + milliseconds" frequencyformat="Hz" bandwidthformat="octaves">
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Please post below if you have a solution to this error!!! Thank you in advance

Here is a fixed version. You will need to rename it with the original file name.
fixed-version.txt (44.6 KB)
Here is how to fix this type of problem:

First, make a backup copy of the AUP file and put it somewhere safe.

Open the .AUP file in a plain text editor (I’d recommend NotePad++) and go down to line 714 (NotePad++ can show line numbers).
Then delete the illegal characters:

 &#xd83d;&#xdd14;&#xd83d;&#xdd0a;

Do the same for line 727, then save the file.

IMPORTANT: The file must be saved as “plain text” and must have the original file name (including the “.aup” file extension).

Also for future reference, here is the FAQ about it: http://manual.audacityteam.org/man/faq_errors.html#nwf.


Gale

The problem here, as well as several previous cases like this, is that Audacity is saving Unicode supplementary characters (those outside the U+0000…U+FFFF range) as surrogate pairs instead of the required 5- or 6-digit values.

In this case, the problem characters are a bell and a speaker icon, which have the Unicode values U+1F514 U+1F50A (notice that both have five digits, not four). These should be saved in AUP files as :bell::loud_sound:, but instead what’s being saved are the surrogates that would be used to represent these characters in UTF-16.

How does Audacity store strings internally? If it’s with a 2-byte character type (that includes wchar_t in Windows), then the most likely cause is a failure to convert surrogate pairs to the appropriate XML representations. (And if the strings use wchar_t on all platforms, then this is probably a Windows-only issue, because wchar_t is 2 bytes in Windows and 4 bytes in Linux and probably macOS.)

I am not an expert in this but the AUP files are saved as UTF-8 if they include Unicode characters, otherwise ANSI.

The problem occurs on Mac too. We fail problem characters as in the example here because when we tried to parse them before, Audacity would crash.

In my experiments on Windows 10, I saved an AUP file with é as track name then added :bell::loud_sound: to the name in Notepad++. The Audacity track name did then show the bell and speaker. The project was usable until I saved it in Audacity for example by deleting some audio then save. Next time I reopened the project, the syntax error returned.

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Gale

[quote=“Gale Andrews”]I am not an expert in this but the AUP files are saved as UTF-8 if they include Unicode characters, otherwise ANSI.



The problem occurs on Mac too. We fail problem characters as in the example here because when we tried to parse them before, Audacity would crash.



In my experiments on Windows 10, I saved an AUP file with é as track name then added &#x1F514;&#x1F50A; to the name in Notepad++. The Audacity track name did then show the bell and speaker. The project was usable until I saved it in Audacity for example by deleting some audio then save. Next time I reopened the project, the syntax error returned.
[/quote]
Looking more closely I can indeed see that the project save by Audacity converts the &#x1F514; in the AUP file to the UTF-16 hex pair &#xd83d;&#xdd14;. So, looks like a bug. I only tested on Windows so far. I’ll report it when I finish testing.



Thanks for your input, Yarn366.





Gale

[quote=“Yarn366”]The problem here, as well as several previous cases like this, is that Audacity is saving Unicode supplementary characters (those outside the U+0000…U+FFFF range) as surrogate pairs instead of the required 5- or 6-digit values.



In this case, the problem characters are a bell and a speaker icon, which have the Unicode values U+1F514 U+1F50A (notice that both have five digits, not four). These should be saved in AUP files as &#x1F514;&#x1F50A;, but instead what’s being saved are the surrogates that would be used to represent these characters in UTF-16.



How does Audacity store strings internally? If it’s with a 2-byte character type (that includes wchar_t in Windows), then the most likely cause is a failure to convert surrogate pairs to the appropriate XML representations. (And if the strings use wchar_t on all platforms, then this is probably a Windows-only issue, because wchar_t is 2 bytes in Windows and 4 bytes in Linux and probably macOS.)[/quote]

I tested this in Ubuntu 17.04 (running in VirtualBox 5.1.22, though that shouldn’t matter) using the same characters as before. Audacity had no problem loading an AUP file containing the correct character codes, as expected. The resaved AUP file, however, contained the characters themselves rather than codes for surrogate pairs. So, this seems like a Windows-only issue, and is probably caused by internal strings using wchar_t as its character type and the 2-byte version of wchar_t not being interpreted correctly when it’s part of a surrogate pair.

A patch or Git pull request is welcome, if you are a developer.


Gale


Fixing this turned out to be not very difficult. Here is the pull request:

https://github.com/audacity/audacity/pull/197