# Upgrade to 6.6.1 now throws an error **URL:** \ **Category:** General Discussions\ **Created:** [February 25, 2021, 4:08pm UTC](https://forum.iscreensaver.com/t/upgrade-to-6-6-1-now-throws-an-error/644 "2021-02-25T16:08:57Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![edimonrocks](https://forum.iscreensaver.com/letter_avatar_proxy/v4/letter/e/49beb7/32.png) [@edimonrocks](https://forum.iscreensaver.com/u/edimonrocks)\ **Post date:** [February 25, 2021, 4:08pm UTC](https://forum.iscreensaver.com/t/upgrade-to-6-6-1-now-throws-an-error/644/1 "2021-02-25T16:08:57Z")
HI, Just upgraded to 6.6.1 and now I’m getting the following error when the screen saver launches (post-build and installation with no errors): “Invalid character line: 2341 column: 17 syntax error: Invalid character\<- at cU” Any ideas? Glen ---
**Author:** ![iScreensaver](https://forum.iscreensaver.com/user_avatar/forum.iscreensaver.com/iscreensaver/32/24_2.png) [@iScreensaver](https://forum.iscreensaver.com/u/iScreensaver)\ **Post date:** [February 25, 2021, 4:22pm UTC](https://forum.iscreensaver.com/t/upgrade-to-6-6-1-now-throws-an-error/644/2 "2021-02-25T16:22:21Z")
Hi, can you say more? is this mac? windows? What version of the OS are you using? What sort of content is in the screensaver? (images, movies…) ---
**Author:** ![edimonrocks](https://forum.iscreensaver.com/letter_avatar_proxy/v4/letter/e/49beb7/32.png) [@edimonrocks](https://forum.iscreensaver.com/u/edimonrocks)\ **Post date:** [February 25, 2021, 7:29pm UTC](https://forum.iscreensaver.com/t/upgrade-to-6-6-1-now-throws-an-error/644/3 "2021-02-25T19:29:03Z")
Windows 10 w/latest updates. Content includes both images and movies. I’ve been using iScreensaver since August and never had this error. I can try recreating my existing screen saver project and see if is a file related issue, but it was working fine on 6.6. ---
**Author:** ![iScreensaver](https://forum.iscreensaver.com/user_avatar/forum.iscreensaver.com/iscreensaver/32/24_2.png) [@iScreensaver](https://forum.iscreensaver.com/u/iScreensaver)\ **Post date:** [February 25, 2021, 8:36pm UTC](https://forum.iscreensaver.com/t/upgrade-to-6-6-1-now-throws-an-error/644/4 "2021-02-25T20:36:09Z")
We’ve never seen that problem, and based on the error message, it sounds a bit like the file might have been corrupted. This can happen in a number of ways, including using file synchronization / shared programs such as Box or OneDrive, antivirus programs, and jsut plain old failures with hard drives, SSDs, or networking. In iScreensaver Designer, Preferences, Cache, please do a Deep Clean, then quit the app, restart it, re-build your screensaver installer and try again. If that doesn’t work, please let us know? ---
**Author:** ![edimonrocks](https://forum.iscreensaver.com/letter_avatar_proxy/v4/letter/e/49beb7/32.png) [@edimonrocks](https://forum.iscreensaver.com/u/edimonrocks)\ **Post date:** [February 25, 2021, 10:14pm UTC](https://forum.iscreensaver.com/t/upgrade-to-6-6-1-now-throws-an-error/644/5 "2021-02-25T22:14:01Z")
Well, my sincere apologies. I had a powerpoint in one of my picture folders and that was wreaking havoc. Maybe a future release could include flagging of non-pic/movie files (i.e., if ends in .doc, .pptx, .xls, .txt, then display “hey, why did you put this file type in a picture folder!!”) ---
**Author:** ![iScreensaver](https://forum.iscreensaver.com/user_avatar/forum.iscreensaver.com/iscreensaver/32/24_2.png) [@iScreensaver](https://forum.iscreensaver.com/u/iScreensaver)\ **Post date:** [February 25, 2021, 10:18pm UTC](https://forum.iscreensaver.com/t/upgrade-to-6-6-1-now-throws-an-error/644/6 "2021-02-25T22:18:01Z")
Interesting - I believe that Designer is supposed to filter out invalid file types, but perhaps that’s not working all the time. Was the offending file .PPT or .PPTX or something else? ---
**Author:** ![edimonrocks](https://forum.iscreensaver.com/letter_avatar_proxy/v4/letter/e/49beb7/32.png) [@edimonrocks](https://forum.iscreensaver.com/u/edimonrocks)\ **Post date:** [February 25, 2021, 11:02pm UTC](https://forum.iscreensaver.com/t/upgrade-to-6-6-1-now-throws-an-error/644/7 "2021-02-25T23:02:17Z")
It was a PPTX