Dashboard export to PDF "error occured"

[rahul narayanka]

When I Try to export dashboard into PDF error pops up "An unexpected error has occurred. Please contact your system administrator"  

can anyone know. how can we fix this

[pratiksha5]

 Which dashboard you are trying to access? 

Do you have permissions? did it work before?

[rahul narayanka]

For all users same error pops up. dashboard export to PDF is working fine. in Dev and Test Environment