Hello!

I have this error when i want to upload .pdf files to a provider.
Here the log:

2015-10-06 15:31:01.005;I;FTP Library 3.3.5.683;;
2015-10-06 15:31:01.006;I;     STATECHANGE: Connecting to server;;
2015-10-06 15:31:01.008;I;     FTPREPLY: cmd: ; Code: 220; Text: 220 Welcome to bidule FTP server;;
2015-10-06 15:31:01.009;I;     STATECHANGE: Sending authentication data;;
2015-10-06 15:31:01.010;I;     FTPREPLY: cmd: USER toto; Code: 331; Text: 331 Password required;;
2015-10-06 15:31:01.011;I;          230 User logged in.;;
2015-10-06 15:31:01.012;I;     FTPREPLY: cmd: PASS ****; Code: 230; Text: 230-"Hello toto!";;
2015-10-06 15:31:01.013;I;          211 END;;
2015-10-06 15:31:01.014;I;           REST STREAM;;
2015-10-06 15:31:01.015;I;           MDTM;;
2015-10-06 15:31:01.016;I;           SIZE;;
2015-10-06 15:31:01.017;I;           HOST;;
2015-10-06 15:31:01.018;I;           CCC;;
2015-10-06 15:31:01.019;I;           PROT C;P;;;
2015-10-06 15:31:01.020;I;           PBSZ;;
2015-10-06 15:31:01.021;I;           AUTH TLS;TLS-C;SSL;TLS-P;;;
2015-10-06 15:31:01.022;I;           UTF8;;
2015-10-06 15:31:01.023;I;           LANG EN*;;
2015-10-06 15:31:01.024;I;     FTPREPLY: cmd: FEAT; Code: 211; Text: 211-Extended features supported:;;
2015-10-06 15:31:02.000;I;     FTPREPLY: cmd: OPTS UTF8 ON; Code: 200; Text: 200 OPTS UTF8 command successful - UTF8 encoding now ON.;;
2015-10-06 15:31:02.001;I;     FTPREPLY: cmd: PWD; Code: 257; Text: 257 "/toto" is current directory.;;
2015-10-06 15:31:02.002;I;     STATECHANGE: Connected to server - idle;;
2015-10-06 15:31:02.003;I;     CONNECTED;;
2015-10-06 15:31:02.004;I;Connected;;
2015-10-06 15:31:02.005;I;     STATECHANGE: Sending data to server;;
2015-10-06 15:31:02.006;I;     STATECHANGE: Setting transfer mode;;
2015-10-06 15:31:02.008;I;     FTPREPLY: cmd: TYPE I; Code: 200; Text: 200 Type set to I.;;
2015-10-06 15:31:02.009;I;     STATECHANGE: Changing current directory;;
2015-10-06 15:31:02.010;I;     FTPREPLY: cmd: CWD /; Code: 250; Text: 250 CWD command successful.;;
2015-10-06 15:31:02.011;I;     STATECHANGE: Sending data to server;;
2015-10-06 15:31:02.012;I;     STATECHANGE: Checking remote file size;;
2015-10-06 15:31:03.000;I;     FTPREPLY: cmd: SIZE VM_TRO20151006.pdf; Code: 550; Text: 550 The system cannot find the file specified.;;
2015-10-06 15:31:03.001;I;     STATECHANGE: Sending data to server;;
2015-10-06 15:31:03.002;I;     STATECHANGE: Getting secondary data channel;;
2015-10-06 15:31:03.003;I;     FTPREPLY: cmd: PASV; Code: 227; Text: 227 Entering Passive Mode (208,181,59,19,235,153).;;
2015-10-06 15:31:03.004;I;     STATECHANGE: Checking remote file size;;
2015-10-06 15:31:03.006;I;     STATECHANGE: Setting restart position;;
2015-10-06 15:31:03.007;I;     FTPREPLY: cmd: REST 0; Code: 350; Text: 350 Restarting at 0.;;
2015-10-06 15:31:03.008;I;     STATECHANGE: Sending data to server;;
2015-10-06 15:31:03.009;I;     FTPREPLY: cmd: STOR VM_TRO20151006.pdf; Code: 550; Text: 550 Access is denied.;;
2015-10-06 15:31:03.010;I;     STATECHANGE: Connected to server - idle;;
2015-10-06 15:31:03.011;E;     DONE, Error=40550 (Access is denied. );;
2015-10-06 15:31:05.001;I;     STATECHANGE: Executing command on the server;;
2015-10-06 15:31:05.002;I;     STATECHANGE: Connected to server - idle;;
2015-10-06 15:31:05.003;I;     FTPREPLY: cmd: QUIT; Code: 221; Text: 221 "Goodbye toto!";;
2015-10-06 15:31:05.004;I;     STATECHANGE: Disconnected from server;;
2015-10-06 15:31:05.005;I;     DISCONNECTED...;;

I've trie the same thing with FileZilla without problem.
Can you help?

Ok Thank you very much.
It was the problem.

Letting empty the base directory isn't a good idea finaly ^^'