ERROR: concurrent insert in progress

Hi,

I have problem with my DB:

snort=# vacuum full;
WARNING:  index "ip_src_idx" contains 1921678 row versions, but table
contains 1921693 row versions
HINT:  Rebuild the index with REINDEX.
WARNING:  index "ip_dst_idx" contains 1921668 row versions, but table
contains 1921693 row versions
HINT:  Rebuild the index with REINDEX.
ERROR:  could not read block 988 of relation 1663/16384/16472:
Input/output error
snort=# reindex index ip_src_idx;
ERROR:  concurrent insert in progress


How to solve this problem? Is there any other method fixing the index?

thanks in advance,

Ganbold