Spool request complete with problem

Dear All,

When i am checking logs in SP01, There are many spool requests which is completed with problems.

The error log is showing

SAP spool error log
      =====================

Print request processing log


Character converter active when first problem occurred

Data was saved with character set 1100
Data will be converted to character set 1143 (synt = 1143)

Errors occurred processing this print request


OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output
OTF module: Unknown print control SC180 should be output


Most important attributes of spool request

Request number 26104

Request name SCRIPT ZRAM AKMALL
Client 999
Owner AKMALL
Request attributes
Time created   2009042512584200
Remaining life  +00007235959
Dispo 1 (Go/Hold) G
Dispo 2 (Keep/Delete)     D
Dispo 3 (Indirect/Direct) D
Default output device ZRAM
Default no. copies  1
Format DINA4
Main print request characteristics

Spool request number 26104
Print request number 1
Print request attributes
Time created   2009042512584200
Output device ZRAM
Format DINA4

Character converter active when first problem occurred

No information available
      SAP spool error log
      =====================

Print request processing log
Print output may not be as intended


Most important attributes of spool request

Request number 26104

Request name SCRIPT ZRAM AKMALL
Client 999
Owner AKMALL
Request attributes
Time created   2009042512584200
Remaining life  +00007235959
Dispo 1 (Go/Hold) G
Dispo 2 (Keep/Delete)     D
Dispo 3 (Indirect/Direct) D
Default output device ZRAM
Default no. copies  1
Format DINA4
Main print request characteristics

Spool request number 26104
Print request number 1
Print request attributes
Time created   2009042512584200
Output device ZRAM
Format DINA4

Character converter active when first problem occurred

No information available

Plz suggest what should i do to complete these type of requests successfully.

Thansk in advance,

Ankit