Macintosh OS/iMovie Error (-50)

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this is what im talking about
this is what im talkin  
i just made a imove project and i want to put it on youtube (ive dont this before and it had worked) and i go to "share" then click on "media browser" and i select the meduim/large/hd (ive done everything) and it says this
"Unable to prepare project for publishing. the project could not be prepared for publishing because an error occured. (-50)"
i am very very confused and i NEED help

Answer
File writing error, the source hard drive or destination could need DiskUtility Repair.
The Destination drive could be partitioned for FAT32, or NTFS rather than Mac. Maybe.

It is a common problem - A Google for
<a href="https://www.google.com/search?q=imovie+error+50">
Brings up many links

This is one - <a href="https://discussions.apple.com/thread/3752422">
Bengt Wärleby   
This helped meRe: iMovie error -50
Feb 20, 2012 11:05 PM (in response to NuitBleu)
My notes on this - may be of help.
Error -50   paramErr  Error in user parameter list
Can there be any external hard disks - if so How 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 ?
Pictures
• in what format ? .jpg, .bmp, .tif, else ?
Audio
• from where/what format ? iTunes, .avi, .mp3, .aiff, else ?
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..

Another -  http://www.justanswer.com/mac-computers/47jcu-mac-imovie-error-code-50.html

Macintosh OS

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David Anders

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Seattle - The Computer Guy - 15 yr veteran Mac/PC/network problem solving. Clients are design firms, artists, freelancers and photographers. PLEASE PLEASE provide EXACT info for Mac Model and OS Version. RAM installed - added cards - external devices - recent changes. Do you do MONTHLY MAINTENANCE? With what Utility? What you have tried and what result do you want.

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