Hi Florencia,
It seems like report is corrupted some how.
To check report is existing in filestore or not , go to report in Launchpad->Properties->check File name , there should be frs path assigned to it.If not it is corrupted.
frs://Input/a_067/064/004/278595/auytslwhrgrdneqcvzbefs0-guid[atli.nsurgzit4q8pfgonmi].wid
If it corrupted , check in myfavourites : ~webintelligence folder , there you can find last auto saved instance.If not we may need to create new report.