Every time I try to export my movie from iMovie, I keep getting a message that states, "Unable to prepare project for publication. The project could not be prepared for publication because an error occurred. (-50). HELP

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Every time I try to export my movie from iMovie, I keep getting a message that states, "Unable to prepare project for publication. The project could not be prepared for publication because an error occurred. (-50). HELP
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Hi
Error -50 paramErr  Error in user parameter list
Can there be any external hard disks - if so How is/are it/they formatted ? Must be Mac OS Extended (hfs) if used for Video.
UNIX/DOS/FAT32/Mac OS Exchange - works for most but not for VIDEO.
What this means in Your situation is above me.
• free space on internal boot hard disk? How much ?
Video codec
• streamingDV, AIC etc. (not .avi, .mp4, .m4v, .wmv etc as they are containers not codecs)
Pictures
• in what format ? .jpg, .bmp, .tif, else ?
Audio
• from where/what format ? iTunes, .avi, .mp3, .aiff, else ?
Trash the Preference file:
The "com.apple.iMovie.plist" file
Many users has not observed that there are TWO libraries.
• Library - at root level
• Library - in user/account folder - THIS IS THE ONE to look into
from Luke Burns
I fixed the problem.. but it was very, very strange. I had a very long section for credits and set the line spacing to 1.0.. for some reason this caused it. I removed it, and it worked fine. I put it back, and I couldn't preview or play the video.
I don't know why that could cause that big of a problem, but it did..
Klaus1
You need more free space on your hard drive.
jonorparkerjon
After phone support from apple I ended up creating a new project and adding all 117 clips back in individually till I found out what clips flagged and would not allow me to export. I had 3 I deleted and replaced and everything works now 1hr after tedious work....
Where do Your material come from
• Camera
• External hard disk
• USB-memory
And all are connected so that iMovie can find it ?
from: jonorparkerjon
After phone support from apple I ended up creating a new project and adding all 117 clips back in individually till I found out what clips flagged and would not allow me to export. I had 3 I deleted and replaced and everything works now 1hr after tedious work....
from Karsten S
Shorter clips than 1,5 sec might be one of the culptrits
Bengt cont.
Set-Up might differ
• Mac OS - most probably X.7 or more
• iMovie version - more than iM'11 v. 9.0.4
Action taken
• Finalizing project - I never do as I never understood the gain to do so
• Share as HD to iDVD - never give any gain but if it works the resulting DVD is less quality than if SD-quality was shared
fps - set
•I only use PAL (25fps)
Yours Bengt W