function get_blocks returns many errors in stderr

Below are examples of errors:

[1529589868] ERROR, failed to read servers from blk/header.hdr
5B2BB06C ERROR, failed to read servers from blk/header.hdr
[1529589868] ERROR, failed to read header 00000000
5B2BB06C ERROR, failed to read header 00000000
PROCESSING BLOCKS
GetBlocks READ VIP keys for first hash (len:238)
INFO, stored VIP keys in vip/23A7002738367EC99A7BD2988720FF0824580219D2502226084E1BCE11A0B634.vip

[1529590003] ERROR vipkey (1) not found E94D3804F571F09DF834DC05D2FBD83D4B5F622360AF5C7F4B180208565C1D1A
5B2BB0F3 ERROR vipkey (1) not found E94D3804F571F09DF834DC05D2FBD83D4B5F622360AF5C7F4B180208565C1D1A
[1529590003] ERROR vipkey (7) not found BBF666968C1D13D92DC52703034B469B39D9094EE3B6033F5A0C8BC34BFF9BE9
5B2BB0F3 ERROR vipkey (7) not found BBF666968C1D13D92DC52703034B469B39D9094EE3B6033F5A0C8BC34BFF9BE9
[1529590003] ERROR vipkey (6) not found 54925F3787EDBC6F5D23E13274599E0331C95BD5C7C619123C37052713B4CA8D
5B2BB0F3 ERROR vipkey (6) not found 54925F3787EDBC6F5D23E13274599E0331C95BD5C7C619123C37052713B4CA8D
[1529590003] ERROR vipkey (2) not found 1D0884646BC3F6C26BD96A2B0A25F6FAF4F95DCDEB7308AE915420AD8E3F72D4
5B2BB0F3 ERROR vipkey (2) not found 1D0884646BC3F6C26BD96A2B0A25F6FAF4F95DCDEB7308AE915420AD8E3F72D4
[1529590003] ERROR vipkey (5) not found A1A403D9C1F880F7EA9AD08A7538D71AA6D3EB7E7D01F15A6A1AFFDE5C916BD6
5B2BB0F3 ERROR vipkey (5) not found A1A403D9C1F880F7EA9AD08A7538D71AA6D3EB7E7D01F15A6A1AFFDE5C916BD6
[1529590003] ERROR vipkey (3) not found 62DF57A186B0B55C2FBDA73B96FCEA05225FDBBB2C669920DA51BEB6DE55DCDB
5B2BB0F3 ERROR vipkey (3) not found 62DF57A186B0B55C2FBDA73B96FCEA05225FDBBB2C669920DA51BEB6DE55DCDB
[1529590003] ERROR vipkey (4) not found 7D9649D9D0AC15C12C4CA6FFC023E30CCEA5D4F882D7829D7204891D376CF3D4
5B2BB0F3 ERROR vipkey (4) not found 7D9649D9D0AC15C12C4CA6FFC023E30CCEA5D4F882D7829D7204891D376CF3D4
[1529590003] ERROR failed to confirm enough signature for header 5B2BB0C0 (2*0<7)
5B2BB0F3 ERROR failed to confirm enough signature for header 5B2BB0C0 (2*0<7)
SAVED 2 headers from 5B2BB0A0 to 5B2BB0C0

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function get_blocks returns many errors in stderr #94