Out of Disk Space

Servers: NW 5.1.7
Workstation: Windows 98SE with client32 v3.4
There is a batch file that copies files from server A to server B. At certain point, the copying gets stuck and message is displayed on the workstation: “”Network Status. Client32: out of disk space writing file to server B.” Unless I press OK, the copying will not continue. There’s plenty of space and memory, no quotes or user restrictions on server B.