My guess was right. Your transaction is spending from a long chain of unconfirmed outputs. It means this unconfirmed transactions or his parents has to confirm first before it does.
Why does it say “Transaction does not exist”?
2. Previous transaction unconfirmed: Your transaction can’t be confirmed if any previous transactions connecting to yours are unconfirmed. You’ll need to wait till all previous transactions are confirmed first. You can also use our accelerator to help with that.
As stated above, you can still use them but you have to enter them in order (Parent --> Child)
I didn't finish the chain but here's what I've found. You have to find where this long chain of unconfirmed transactions originated and for that you have to paste the first TXID in the quote below on chain.so after that click the
"Raw Data" and copy the Tx hex at the bottom without the ("") and paste it here:
https://blockchain.info/pushtx and you'll see its missing parent
7d338ed966104f287551a3fb9e950e7e4dbcb662fdbf431fc4cb85f46efe4d34
ffc9c93dbb4ba6dda4ee045afb406db8c37f04112b30dfb4cfa27c35aaaeda41
015b2e46d7969364ca32cae3f8faa94bb6ae65ed37965da46f4d00b2a3e1b7bc
46dfcdb0479b7ef22ee9a803aaba1ce552bd0ff33dd023d9df1d1baaef8b8d31
d038f3f249d27b3c5fbaab90844e3db39d91e2a526b4d128e1aed159428c8e78
886ae01469a5abd301f7d494d8a2041351e8adacd260f0514088b5b9883828a8
14d33a9d00c0f36ccb6a8adcc3872fabcf78c45a820fdef6002909056665dd3c
e3ff87183d985b2d13ad8a1cc0be30d5a3a97c6c3f4e57d6ffe2f0bf7fe2cbc6
7f1918ebe4b8edf53940e01ab844bcc2a953fa6e15c443f3e7a5b7c91b354eaa
9ac44f44553a2e521f2eec25b1c3081cc1013d7771753eb7874654c3b1660942
9133ad9f70550abacc20eb139d7c4f761f0ce9fe63758168f309fdc36f3e44ee
6f1f457b325dd4e62c744a3799daa00811e84b5df472f35812edb921c974ea26
8baf9c2be33c46616d06ed9f9495987dae93752e40f29dc64daff7871ba59d6b
2ddfab26e47100bc4b958a7d42575000ae702e72955ea3dbbca43369db960611
b49e1f6be39e0bf7bf62171999fe50b5a576fc4f30fee26e1b804e54370244cb
52fdd26a0eff1c2f7c9691e37bd5e8ee9b93e3944fd725ca711d8fe691e84bc4 (Your TX)
Honestly It's just better to wait until these transactions (including yours) are dropped since it will be spendable again.