当我使用pg_dump 备份postgres 时，出现错误，我该如何摆脱这个错误？
when I use pg_dump to back up postgres, an error occur, how can I get rid of this error?
输出信息在这里：
pg_dump: Dumping the contents of table "categorytype_show" failed: PQgetResult() failed.
pg_dump: Error message from server: ERROR: character with byte sequence 0xef 0xbb 0xbf in encoding "UTF8" has no equivalent in encoding "GBK"
pg_dump: The command was: COPY public.categorytype_show (categoryid, categorylevel, categoryname, categoryparentid, leafcategory, catalogenabled, autopayenabled, b2bvatenabled, bestofferenabled, expired, intlautosfixedcat, keywords, lsd, numofitems, orpa, orra, sellerguaranteeeligible, virtual, itemtype, isselect, imgurl, id, ctime) TO stdout;
他们的关键是：
ERROR: character with byte sequence 0xef 0xbb 0xbf in encoding "UTF8"
has no equivalent in encoding "GBK"
您有一个编码错误。为了克服这个问题，将 UTF8 格式的数据转储为
pg_dump -E UTF8
还可以考虑使用 -Fc 选项 pg_dump。更多详情：https://www.postgresql.org/docs/9.1/static/app-pgdump.html
输出信息在这里：
pg_dump: Dumping the contents of table "categorytype_show" failed: PQgetResult() failed. pg_dump: Error message from server: ERROR: character with byte sequence 0xef 0xbb 0xbf in encoding "UTF8" has no equivalent in encoding "GBK" pg_dump: The command was: COPY public.categorytype_show (categoryid, categorylevel, categoryname, categoryparentid, leafcategory, catalogenabled, autopayenabled, b2bvatenabled, bestofferenabled, expired, intlautosfixedcat, keywords, lsd, numofitems, orpa, orra, sellerguaranteeeligible, virtual, itemtype, isselect, imgurl, id, ctime) TO stdout;
他们的关键是：
ERROR: character with byte sequence 0xef 0xbb 0xbf in encoding "UTF8" has no equivalent in encoding "GBK"
您有一个编码错误。为了克服这个问题，将 UTF8 格式的数据转储为
pg_dump -E UTF8
还可以考虑使用 -Fc 选项 pg_dump。更多详情：https://www.postgresql.org/docs/9.1/static/app-pgdump.html