can't update key

at first I get `No valid primary key self-signature` and then updating it on the command line I get:

```
Error in your post
-------------------

Code: 100
Name: INPUT_ERROR
Description: bad base 64 string
```

Can you see what's wrong with this `gpg --export -a 21419EEC5F4E941C | gpg --list-packets|pbcopy`?

```
:public key packet:
version 4, algo 1, created 1385985407, expires 0
pkey[0]: [4096 bits]
pkey[1]: [17 bits]
keyid: 21419EEC5F4E941C
:user ID packet: "Charlie Allom "
:signature packet: algo 1, keyid 21419EEC5F4E941C
version 4, created 1422109133, md5len 0, sigclass 0x13
digest algo 2, begin of digest 85 a7
hashed subpkt 27 len 1 (key flags: 03)
hashed subpkt 11 len 5 (pref-sym-algos: 9 8 7 3 2)
hashed subpkt 21 len 5 (pref-hash-algos: 8 2 9 10 11)
hashed subpkt 22 len 3 (pref-zip-algos: 2 3 1)
hashed subpkt 30 len 1 (features: 01)
hashed subpkt 23 len 1 (key server preferences: 80)
hashed subpkt 2 len 4 (sig created 2015-01-24)
hashed subpkt 9 len 4 (key expires after 6y53d2h21m)
subpkt 16 len 8 (issuer key ID 21419EEC5F4E941C)
data: [4096 bits]
:signature packet: algo 17, keyid 70B203213AF59D16
version 4, created 1391691958, md5len 0, sigclass 0x10
digest algo 2, begin of digest e1 c1
hashed subpkt 2 len 4 (sig created 2014-02-06)
subpkt 16 len 8 (issuer key ID 70B203213AF59D16)
data: [160 bits]
data: [159 bits]
:signature packet: algo 1, keyid 0A3E18DA8486EDA8
version 4, created 1391929486, md5len 0, sigclass 0x10
digest algo 2, begin of digest 68 41
hashed subpkt 2 len 4 (sig created 2014-02-09)
subpkt 16 len 8 (issuer key ID 0A3E18DA8486EDA8)
data: [4095 bits]
:signature packet: algo 1, keyid 650FE2C5ACE1D7B2
version 4, created 1421934565, md5len 0, sigclass 0x10
digest algo 2, begin of digest 3d cf
hashed subpkt 2 len 4 (sig created 2015-01-22)
subpkt 16 len 8 (issuer key ID 650FE2C5ACE1D7B2)
data: [4095 bits]
:signature packet: algo 1, keyid 21419EEC5F4E941C
version 4, created 1385985407, md5len 0, sigclass 0x13
digest algo 2, begin of digest cc 76
hashed subpkt 2 len 4 (sig created 2013-12-02)
hashed subpkt 27 len 1 (key flags: 03)
hashed subpkt 9 len 4 (key expires after 2y0d0h0m)
hashed subpkt 11 len 5 (pref-sym-algos: 9 8 7 3 2)
hashed subpkt 21 len 5 (pref-hash-algos: 8 2 9 10 11)
hashed subpkt 22 len 3 (pref-zip-algos: 2 3 1)
hashed subpkt 30 len 1 (features: 01)
hashed subpkt 23 len 1 (key server preferences: 80)
subpkt 16 len 8 (issuer key ID 21419EEC5F4E941C)
data: [4096 bits]
:signature packet: algo 17, keyid 189DC4B78F6711D2
version 4, created 1424988352, md5len 0, sigclass 0x10
digest algo 2, begin of digest be 2f
hashed subpkt 2 len 4 (sig created 2015-02-26)
subpkt 16 len 8 (issuer key ID 189DC4B78F6711D2)
data: [156 bits]
data: [159 bits]
:signature packet: algo 1, keyid 6BF7CDDEC59D340E
version 4, created 1424993038, md5len 0, sigclass 0x12
digest algo 10, begin of digest e2 22
hashed subpkt 2 len 4 (sig created 2015-02-26)
subpkt 16 len 8 (issuer key ID 6BF7CDDEC59D340E)
data: [2048 bits]
:signature packet: algo 1, keyid F121049884067F6B
version 4, created 1425244289, md5len 0, sigclass 0x13
digest algo 2, begin of digest cb 26
hashed subpkt 2 len 4 (sig created 2015-03-01)
subpkt 16 len 8 (issuer key ID F121049884067F6B)
data: [4095 bits]
:signature packet: algo 1, keyid FED1B7C5911FF0BB
version 4, created 1425593683, md5len 0, sigclass 0x10
digest algo 2, begin of digest 50 d4
hashed subpkt 2 len 4 (sig created 2015-03-05)
subpkt 16 len 8 (issuer key ID FED1B7C5911FF0BB)
data: [4095 bits]
:signature packet: algo 1, keyid FC8B93B5290CF49F
version 4, created 1425709919, md5len 0, sigclass 0x10
digest algo 2, begin of digest 5f 0a
hashed subpkt 2 len 4 (sig created 2015-03-07)
subpkt 16 len 8 (issuer key ID FC8B93B5290CF49F)
data: [4095 bits]
:signature packet: algo 1, keyid CFD9C564EC616C91
version 4, created 1447377685, md5len 0, sigclass 0x10
digest algo 2, begin of digest db 93
hashed subpkt 2 len 4 (sig created 2015-11-13)
subpkt 16 len 8 (issuer key ID CFD9C564EC616C91)
data: [4096 bits]
:signature packet: algo 1, keyid 9F809E47DB78D4BF
version 4, created 1447371653, md5len 0, sigclass 0x10
digest algo 2, begin of digest bb 29
hashed subpkt 2 len 4 (sig created 2015-11-12)
subpkt 16 len 8 (issuer key ID 9F809E47DB78D4BF)
data: [4095 bits]
:signature packet: algo 17, keyid 0B043DD132CB6C7B
version 4, created 1447777053, md5len 0, sigclass 0x10
digest algo 2, begin of digest 16 d0
hashed subpkt 2 len 4 (sig created 2015-11-17)
subpkt 16 len 8 (issuer key ID 0B043DD132CB6C7B)
data: [153 bits]
data: [159 bits]
:signature packet: algo 1, keyid 756E7A350C4FAC3F
version 4, created 1448211662, md5len 0, sigclass 0x10
digest algo 8, begin of digest c4 13
hashed subpkt 2 len 4 (sig created 2015-11-22)
subpkt 16 len 8 (issuer key ID 756E7A350C4FAC3F)
data: [4095 bits]
:signature packet: algo 1, keyid CAFB3BAD0A75C877
version 4, created 1448245491, md5len 0, sigclass 0x10
digest algo 2, begin of digest 64 af
hashed subpkt 2 len 4 (sig created 2015-11-23)
subpkt 16 len 8 (issuer key ID CAFB3BAD0A75C877)
data: [4095 bits]
:public sub key packet:
version 4, algo 1, created 1385985407, expires 0
pkey[0]: [4096 bits]
pkey[1]: [17 bits]
keyid: E651802F146E3805
:signature packet: algo 1, keyid 21419EEC5F4E941C
version 4, created 1385985407, md5len 0, sigclass 0x18
digest algo 2, begin of digest bd e2
hashed subpkt 2 len 4 (sig created 2013-12-02)
hashed subpkt 27 len 1 (key flags: 0C)
hashed subpkt 9 len 4 (key expires after 2y0d0h0m)
subpkt 16 len 8 (issuer key ID 21419EEC5F4E941C)
data: [4093 bits]
```

Start by reproducing the reported `gpg --export -a 21419EEC5F4E941C | gpg --list-packets|pbcopy` flow and compare its packet output with the command-line update response. Trace the update path that reports `INPUT_ERROR` and determine what makes this exported key data invalid; done means the cause and a verified correction are identified.

Written by the indexing model from the issue text.