Hi sephewi,
sorry about your situation. It looks like your file may have corrupted somehow.
My first guess would be that the component mentioned in the error got corrupted during the saving process, or maybe something else altered it.
Do you maybe remember which components you were using, and is this one crucial for your project? If not, you can manually remove it. If you open your project (.rcproj file) as a text file, you can scroll down to the element ‘‘reconstructions’’. From there you can remove your component by selecting it and deleting it.
Here is an example of how it may look like:
Please, do this on the copy of your project file.
Are you storing your project on a local drive? Did you maybe prematurely close RealityCapture while it was saving the project? Have you deleted some images from the source folder or cleared the CACHE? Where do you have selected the cache folder? How often is cache cleared?