We need more information:
Please tell us what operating system (exactly) you're running. Please tell us (exactly) what InDesign version you're using.
Do you have a backup of the file (Time Machine? Dropbox? Another backup method?)
Thank you very much for your answer.
My operating system:
iMac (24-inch, Early 2009)
3,06 GHz Intel Core 2 Duo
4 GB 1333 MHz DDR3
NVIDIA GeForce GT 130 512 MB
InDesign version: 2018 CC • V.13.0
There is no backup of the file. 😞
I'm afraid that I don't have good news. It appears your file is damaged and you cannot open it.
If you were using the latest version of InDesign (16.0, which came out October 2020), there would be feature which would offer to try to detect errors and correct the file:
If you had a backup, you could use it to recover the file. It always highly recommended that you have a plan to backup your files to use in such a case.
Lacking that, you'll have to re-create the file, I'm afraid.
I also see no chance to open this file. It might be damaged beyond repair.
About 230 kb of its file size are missing. At least that was the result after I ran the document against Werner Perplies' script WpsIndFileIdentifier:
Hm. Seems that this document is saved last time with a very early version of InDesign CC 2018. A version that had no bug fixes at all. Maybe that contributed to the issue?
( ACP )