String reference not set to an instance of a String. Parameter name: s

I'd be greatfull for any guidance or help. Thanks.

Command I'm using is:

SQLsafeCmd.exe Restore refresh_20180119142448 "\\DB-01\SQLBackups\TEST\estdb\DB-01_TEST_testdb_Full_201801131651.safe" -RecoveryMode NoRecovery -Server "DB-01" -InstanceName TEST -Move testdb D:\SqlData\testdb_20180119142448.mdf -Move testdb_log E:\SqlLog\testdb_log_20180119142448.ldf

Error I get is:

String reference not set to an instance of a String. Parameter name: s

SQLsafe Backup and Recovery CLI Version 8.4.2.149 (x64)
Copyright (c) 2004-2017 Idera, Inc., All Rights Reserved.
<http://www.idera.com/>

Connecting to service on DB-01...success. (8.4.2.149)

RESTORE refresh_20180119142448...FAILED.
Statuses:
Database name: refresh_20180119142448, Result: Server instance: DB-01\TEST, Database: refresh_20180119142448
String reference not set to an instance of a String.
Parameter name: s