Adobe Animate CC .fla file has an error while opening

I just had a similar issue although, I didn't get the second error message that you got. I managed to recover my file by right clicking the file and selecting one drive. From the next drop down I selected version history. My most recent save still had the error message but my last save before that worked. I lost a little bit of work but it wasn't too bad since I save often.

I had the same problem, the way I fixed it was through the WinRAR, such as rename the .fla to .rar, then using the WinRAR repair to repair the said .rar file, then renamed it back to .fla. At first this didn't work, so I duplicate the original file with the name (example.fla), and renamed it to (recovery.fla) then only I renamed it to (recovery.rar), and I repeated the same process, and it works. but still, 20% of the file is gone, but at least i got 80% back.

Guys do all the things you can, it may work for you but if all the things done by you is not working. 

Then the only thing will work is

if you want to get back your .fla file back, the last option is to convert your swf file into  .fla file from adobe animte you can do this

Click ok file

Then click on New

Then make a new project, action script 3.0

After making a new project 

Click on file 

Then Click on Import

Then Import to Stage

Select your swf file then ok

You will get the things not like previous but yes, you'll get something which you can create again. 

Believe me it works. 

i found the fix although it might be a compromise: i hope it works for you guys as well

so there was comment somewhere on the internet that said that if you have Auto-self recovery turned on your file is never lost. anyways long story short.

i right clicked on the file that was corrupt and went into properties.

all i did was going into the previous version tab and restoring it.

now this will bring a prev version of file. its not a perfect solution but it's better than nothing also i would recommend finding the auto recovery file path if it's missing from the original folder which is usually situated in the *win: C:\Users\<username>\AppData\Local\Adobe\<animate version>\en_US\Configuration

keep in mind that sometimes it has slightly different path.

good luck