SPRX123 - Document not found (path &2&3&4, error code &1)

SAP Error Message - Details

• Message type: E = Error

• Message class: SPRX - Proxy Generation

• Message number: 123

• Message text: Document not found (path &2&3&4, error code &1)

What causes this issue?

The error occurred while calling cl_gui_frontend_services=>gui_upload;
the file with the specified path could not be loaded. Error code 1
generally means that the file does not exist.
The following are possible error codes:
file_open_error = 1
file_read_error = 2
no_batch = 3
gui_refuse_filetransfer ,, = 4
invalid_type,,,,,, = 5
no_authority,,,,,, = 6
unknown_error ,,,, = 7
bad_data_format ,,,, = 8
header_not_allowed = 9
separator_not_allowed = 10
header_too_long = 11
unknown_dp_error = 12
access_denied = 13
dp_out_of_memory = 14
disk_full = 15
dp_timeout = 16
not_supported_by_gui = 17
error_no_gui = 18
OTHERS = 19

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.