Project File Damaged Error Message for all projects open with AE2015

i having issue whenever try open project in ae 2015 (13.5.1.48).  thought 1 project (and of auto saves tried opening of project month , half ago), tried open project , got same exact "warning".  thoughts?  started having error problem yesterday.  gave on troubleshooting , downloaded latest update through cc.  file use weekly.  segment graphic make small changes new picture @ end , re-export each time , i've never had issue previously. have tried restarting, re-installing ae, re-installing plug ins had switched previous version work in fcp7, restarting again, etc.  still have same problem.

 

so when open main file i've been trying work on - of work remains, of pre-comps , raw video there removed timeline.  deleted.  there still 1 pre-comp used around 14 seconds...it seems unaffected.  ideas?

 

since need work on project have downloaded ae 2014 (13.0.0.214).  opens project fine , have been able make adjustments necessary , exported new file.

here system specs:  mac pro 6,1, 3.5ghz 6-core, 64gb ram

nobody can tell without exact info. losing in vague descriptions. footage? comp settings? effects? else? need more specific.

 

mylenium

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