Could not include font definition file: helvetica

Hi Everybody!
My name is Mardônio, I´m from Brazil!

This is my first post!

I´m running Dolibarr 6.0.0-Beta and have two problems…

when i try send budgets for e-mail or configure my invoices as accepted, i have the following error:

TCPDF ERROR: Could not include font definition file: helvetica

How can i resolv this error?!

Thanks! :happy:

Which os do you use ?
What is package file name/version of dolibarr you used for installation ?

I´m using Linux Os!
This is checking of my version today:
Linux 3.12.74-213.ELK6.x86_64 #1 SMP Tue Jun 20 00:36:01 CDT 2017 x86_64

About package, i used this:

package -> dolibarr-6.0.0-beta.zip

Thanks for help!