× Uploading source images to prepare for transformations - failed!
HTTP Error 400: POST https://res.ionic.io/api/v1/upload
{"Error":"unable to read uploaded image","Width":0,"Height":0,"Type":"png","Vector":false}
Failed to convert the icons and splash screen images
Create a new project with ionic start blank blank. This will have two current example images. Copy these over to your project and run the command. If this works, your images were broken or in the wrong size. Fix that.
If you guys generating the resources from Sketch App. Just open the images in Photoshop or any other image editor and just save and try again. This worked me
Just had the same issue with filed exported in the newest version of sketch. So I opened in an older version and exported again and it worked (Sketch 46.2)