getting error while converting an iview output into pdf format

hi all,

i am new to visual composer and portal.

i have created an iview to display a list. i can see the list but on clicking a button 'copy to pdf' ,i am getting an error message

Portal Runtime Error

An exception occurred while processing your request

Exception id: 04:33_19/09/08_0002_2720650

See the details for the exception ID in the log file.

where can i see this log file?? and what will be the reason for this error? and the way to solve this???

thanks in advance...