ProviderError: Internal JSON-RPC error.

[ClydeMaster]

Hi All,
when I wan to close the whitelist with "yarn whitelist-close --network truffle" I always get this error:

Truffle Dashboard runs in the background. I have enough Matic in my wallet for gas fees.
I followed the masterclass and everything went fine. I wanted to start my last test run and get this problem.

I had this problem also when opening the whitelist. After hours of retrying it worked. But I do not know why. Now the problem again when I want to close the sale again.

Chain: Mumbai Testnet
Version: nft-erc721-collection version 2.4.4
Truffle v5.7.9 (core: 5.7.9)
Ganache v7.7.5
Solidity v0.5.16 (solc-js)
Node v14.18.2
Web3.js v1.8.2

Could you please help me?
Thank you very much in advance!

[Sagezez]

I'm having a similar issue trying to deploy a contract to Mumbai. This has been happening for nearly a week now and I have not been able to deploy. I have searched the error and it has been suggested to set the gas manually as opposed to automatically. Unfortunately, I am unsure where to add in the info.

Deploying contract...
ProviderError: HttpProviderError
at HttpProvider.request (C:\Users\lhopl\Desktop\TEST\nft-erc721-collection-2.4.5\smart-contract\node_modules\hardhat\src\internal\core\providers\http.ts:78:19)
at AutomaticSenderProvider.request (C:\Users\lhopl\Desktop\TEST\nft-erc721-collection-2.4.5\smart-contract\node_modules\hardhat\src\internal\core\providers\accounts.ts:344:34)
at AutomaticGasProvider.request (C:\Users\lhopl\Desktop\TEST\nft-erc721-collection-2.4.5\smart-contract\node_modules\hardhat\src\internal\core\providers\gas-providers.ts:135:34)
at AutomaticGasPriceProvider.request (C:\Users\lhopl\Desktop\TEST\nft-erc721-collection-2.4.5\smart-contract\node_modules\hardhat\src\internal\core\providers\gas-providers.ts:182:36)
at processTicksAndRejections (internal/process/task_queues.js:95:5)
at async EthersProviderWrapper.send (C:\Users\lhopl\Desktop\TEST\nft-erc721-collection-2.4.5\smart-contract\node_modules@nomiclabs\hardhat-ethers\src\internal\ethers-provider-wrapper.ts:13:20)
error Command failed with exit code 1.