The section on creating sub-parts in section (2.3) of: [https://easyeda\.com/andyfierman/Welcome\_to\_EasyEDA\-31e1288f882e49e582699b8eb7fe9b1f](https://easyeda.com/andyfierman/Welcome_to_EasyEDA-31e1288f882e49e582699b8eb7fe9b1f) may help you.

@andyfierman I read through the document you posted, but I still get the error even when I follow your procedure.

Make sure you are not using any illegal characters in the pin names or numbering. You can use this as a guide: [https://easyeda\.com/forum/topic/Net\_and\_Part\_naming\_conventions\-uOHBvN5nh](https://easyeda.com/forum/topic/Net_and_Part_naming_conventions-uOHBvN5nh) Have you managed to make and save a top level part? If yes then please post a link to it or a screenshot of it in the Search Libraries tool so I can find it and see what might be wrong.

I have the same problem. Never before I had any kind of trouble saving subparts. Just create a subpart, add something in the canvas and the message "Undfined Index: dataStr" shows up. Please correct this as a subpart is extreme helpful.

@luizazv @Schafmag cc to @andyfierman when you met this issue, please close the document and reopen it and edit again. it is a know issue, will try to figure it out! Thank you

Same issue. I tried to reopen document, clear browser cache, does not help.

@manfredmann Any steps to repeat it?