Delete some or all manager and stadium pics, this will set free space for more images.
And if your game crashed, while importing a batch of teams for the first time, there are kits, emblems and maybe managers and stadiums pics that were duplicated while importing this batch again successfully.
To delete, go into data management - import/export - deleting images.
Check every category. As i mentioned, managers and stadiums are less important and can be deleted.
The duplicated image versions can be identified easily - those images have no filename shown up on the top of the screen