413 Payload Too Large with response {code=40005, message=Request entity too large}

[pleasehelp111]

@BilliAlpha
Thank you for this great bot, but I seem to have a problem with it that probably doesn't deserve this but I don't know what else can I try to do. Bot seems to get stuck with 413 error every time I try to migrate and after failing to find a solution to the problem online I'm only left with asking you. Sorry in advance for this sounding very rude but English is not my first language so I don't know how to make this sound polite.
This is what it tells me:
2021-12-05 06:47:48 INFO com.billialpha.discord.transfer.DiscordTransfer - Logging in ...
2021-12-05 06:47:50 INFO com.billialpha.discord.transfer.DiscordTransfer - Logged in, user: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Loaded source guild: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Loaded dest guild: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Start action 'migrate'
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Starting migration ...
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating category: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:47:51 INFO com.billialpha.discord.transfer.DiscordTransfer - Migrating channel: *****
2021-12-05 06:49:55 WARN com.billialpha.discord.transfer.DiscordTransfer - Error in channel migration
discord4j.rest.http.client.ClientException: POST /channels/896317808911192090/messages returned 413 Payload Too Large with response {code=40005, message=Request entity too large}
lots of messages...
2021-12-05 06:49:55 INFO com.billialpha.discord.transfer.DiscordTransfer - Migration finished successfully (0 messages)
2021-12-05 06:49:55 INFO com.billialpha.discord.transfer.DiscordTransfer - Logged out
Thank you very much in advance!

[BilliAlpha]

Hello,
Thanks for using my bot.
It seems that you are trying to send a message that is too big, could you try and locate the problematic message ?