Account Config - Import a Chart

[Cosmin2019]

Hi,
Starting with version 5.1, in Account Config if I try to Import a Chart I receive the message:
“Error in account chart import please check the log”

This is the log from tomcat8-stdout:

2019-03-12 18:39:06.630 INFO 32956 — [nio-8080-exec-1] com.axelor.data.csv.CSVImporter : Importing com.axelor.apps.account.db.TaxEquiv from account_taxEquiv.csv
2019-03-12 18:39:06.630 DEBUG 32956 — [nio-8080-exec-1] com.axelor.data.csv.CSVImporter : Header [fiscalPosition_code, fromTax_code, toTax_code]
2019-03-12 18:39:06.723 INFO 32956 — [nio-8080-exec-1] com.axelor.data.csv.CSVImporter : Importing com.axelor.apps.account.db.TaxAccount from account_taxAccount.csv
2019-03-12 18:39:06.786 ERROR 32956 — [nio-8080-exec-1] com.axelor.data.csv.CSVImporter : Error while importing C:\Program Files\Apache Software Foundation\Tomcat 8.5\temp\1552408723370-0\PCG_fr-20190312\account_taxAccount.csv.
2019-03-12 18:39:06.786 ERROR 32956 — [nio-8080-exec-1] com.axelor.data.csv.CSVImporter : No such class found com.axelor.apps.account.db.TaxAccount.

I use Axelor 5.1.4 on Windows 7
Best regards