message: fix: rpx fallback error handling
diff: @@ -114,6 +114,7 @@ export default class ExitManager extends ContractsBase {
  async buildPayloadForExitHermoine(burnTxHash, logEventSig) {
  // check checkpoint
  const lastChildBlock = await this.rootChain.getLastChildBlock()
  + const burnTx = await this.web3Client.getMaticWeb3().eth.getTransaction(burnTxHash)
  const receipt = await this.web3Client.getMaticWeb3().eth.getTransactionReceipt(burnTxHash)
  const block: any = await this.web3Client
  .getMaticWeb3()
  @@ -123,8 +124,24 @@ export default class ExitManager extends ContractsBase {
  new BN(lastChildBlock).gte(new BN(receipt.blockNumber)),
  'Burn transaction has not been checkpointed as yet'
  )
  - let blockIncludedResponse = await axios.get(this.networkApiUrl + '/block-included/' + receipt.blockNumber)
  - let headerBlock = blockIncludedResponse.data
  +
  + let headerBlock
  +
  + try {
  + let blockIncludedResponse = await axios.get(`${this.networkApiUrl}/block-included/${receipt.blockNumber}`)
  + headerBlock = blockIncludedResponse.data
  +
  + if (!headerBlock || !headerBlock.start || !headerBlock.end || !headerBlock.headerBlockNumber) {
  + throw Error('Network API Error')
  + }
  + } catch (err) {
  + console.log(err)
  + const headerBlockNumber = await this.rootChain.findHeaderBlockNumber(burnTx.blockNumber)
  + headerBlock = await this.web3Client.call(
  + this.rootChain.rootChain.methods.headerBlocks(this.encode(headerBlockNumber))
  + )
  + }
  +
  // build block proof
  const start = parseInt(headerBlock.start, 10)
  @@ -132,12 +149,15 @@ export default class ExitManager extends ContractsBase {
  const number = parseInt(receipt.blockNumber + '', 10)
  let blockProof
  + try {
  let blockProofResponse = await axios.get(
  `${this.networkApiUrl}/fast-merkle-proof?start=${start}&end=${end}&number=${number}`
  )
  -
  blockProof = blockProofResponse.data.proof
  if (!blockProof) {
  + throw Error('Network API Error')
  + }
  + } catch (err) {
  blockProof = await this.buildPayloadForExitFastMerkle(start, end, number)
  }
  