HT203200 When I try to sync my iphone to my imac it deletes any apps that I have added on my computer and wont install on my iphone and visa versa. Itunes wont let me authorise from the imac with errors of -54 and -50. Can you pls help??

When I try and sync my iphone (backup) with my imac any apps that I have put on the imac OR my iphone will not sync to eachother, so I lose some of my apps. WHen itunes (on the imac) tells me to authorise the changes/apps and I put my details in, it comes up with an itunes error code of -54 and -50. I cannot sync my iphone correctly to back up on the imac and I need to do this as I use my phone for work. I have an iphone 4GS and run Mac OS X 10.6.8.
Can anyone help me please?

Thank you Carolyn, I understand that and do use the same P/w for both the iphone and the computer and the apps were origionally for the iphone anyway, they just used to back on the computer and now they wont and the imac even cancels them off my iphone when I sync. And it says "Itunes" has made an error, try again...with the coes -54 and -50. This means I canot ack up my iphone properly. 

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