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Then it seems like you have a corrupt clip on the timeline that trigger those errors. As a test, create a new timeline and go to File > New > Bars and Tone and just place it on the new timeline and try to export that. Does it work?
If no, create a brand new project and try Bars and Tone in that project.
If yes, more info is needed such as where does the clips on the timeline comes from. Video camera/phone/pad/screen recording? Please be detailed. 
Thank you for quick reply but what do you mean as using bars and tone?
Since Bars and Tone can be created in Premiere Pro by going to File > New > Bars and Tone and then place that synthetic video on a timeline it´s an easy way to rule out corrupted video and/or a corrupted project.
But, since the project has worked before i would close that project and then create a brand new project and import the old project into the new one and try to export again. If it still throws errors on export, try to reset the Preferences: FAQ: How to reset (trash) preferences in Premiere Pro?
If none of the abowe works deleting the Media Cache Database manually can do wonders. Open your Preferences in Premiere Pro and locate the folder in the image below. Close Premiere Pro and delete that folder you have and open the project again and try to export.
I discovered that reason of error is, effects on audio that I make. I edit my audios with essential sound panel in premiere pro. Without audio effects, export works well, so I took back all effects such as reduce noise, reduce reverb; and make those edits on Audition. Now I solved my problem.
Thanks anyway
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