BES-53248 Error! in reading downloaded file

(sw2)#copy http://server:8080/BES-53248_v2.01_sw2.txt nvram:script BES-53248_v2.01_sw2.scr

Mode........................................... HTTP
Set Server IP.................................. 1.2.3.4:8080
Path........................................... ./
Filename....................................... BES-53248_v2.01_sw2.txt
Data Type...................................... Config Script Destination
Filename....................................... BES-53248_v2.01_sw2.scr

Management access will be blocked for the duration of the
transfer
Are you sure you want to start? (y/n) y
HTTP Configuration Script transfer starting...

Validating configuration
script...

Configuration script validated.
Error! in reading downloaded file.
File transfer failed!