SSIS Multiple-step OLE DB operation generated errors

Well, I don't how to explain this problem, I have two OLE DB Connections that i need to merge and send to an oledb Destination, the source oledb columns are:

tbl clientes totales:

RUT_CLIE numeric(18,0), 
DV(string(1)), CLI_NOM(string(40)), 
CLI_CAT_SUB(string(3)), 
CLI_STA(string(5)), 
CLI_SUB_STA(string(5)), 
**COD_CTR (numeric(18,0))  <- JOIN KEY**, 
nom_ejec(string(50)),
nom_suc(string(100)), 
nom_suc_gpo(string(100)), 
zonal(string(50)), 
id_cargo(string(50)), 
CLI_GRP_NOM(string(25)),  
CANAL(string(50)), 
ACTIVO(int), 
VINCULADO(int), 
VINCULADO_TRX(int), 
CTACTE(int), 
CLI_CAT(string(5))

tbl cartera 1 1:

cod_cartera (numeric(18,0))  <- JOIN KEY
cargo(string(100)),
nom_suc_gpo(string(100))

Destination:

Mapping:

I need to convert many of the columns into nvarchar(255), (I think that's the problem), but when I run the program, this happens:

Error Messages:

[OLE DB Destination [5679]] Error: SSIS Error Code DTS_E_OLEDBERROR.
An OLE DB error has occurred. Error code: 0x80040E21. An OLE DB record
is available. Source: "Microsoft SQL Server Native Client 10.0"
Hresult: 0x80040E21 Description: "Multiple-step OLE DB operation
generated errors. Check each OLE DB status value, if available. No
work was done.".

[OLE DB Destination [5679]] Error: SSIS Error Code
DTS_E_INDUCEDTRANSFORMFAILUREONERROR. The "input "OLE DB Destination
Input" (5692)" failed because error code 0xC020907B occurred, and the
error row disposition on "input "OLE DB Destination Input" (5692)"
specifies failure on error. An error occurred on the specified object
of the specified component. There may be error messages posted before
this with more information about the failure.

[SSIS.Pipeline] Error: SSIS Error Code DTS_E_PROCESSINPUTFAILED. The
ProcessInput method on component "OLE DB Destination" (5679) failed
with error code 0xC0209029 while processing input "OLE DB Destination
Input" (5692). The identified component returned an error from the
ProcessInput method. The error is specific to the component, but the
error is fatal and will cause the Data Flow task to stop running.
There may be error messages posted before this with more information
about the failure.

[SSIS.Pipeline] Error: SSIS Error Code DTS_E_PROCESSINPUTFAILED. The
ProcessInput method on component "Sort" (4898) failed with error code
0xC0047020 while processing input "Sort Input" (4899). The identified
component returned an error from the ProcessInput method. The error is
specific to the component, but the error is fatal and will cause the
Data Flow task to stop running. There may be error messages posted
before this with more information about the failure.

Warnings:

[SSIS.Pipeline] Warning: Warning: Could not open global shared memory
to communicate with performance DLL; data flow performance counters
are not available. To resolve, run this package as an administrator,
or on the system's console.

Please help, i'm really frustrated and stressed right now, so I can't explain myself better, if you don't understand something, please ask and i'll try to make it better.