user4880: I can't use my old Tx creator (cardano-cli) from Alonzo era.
Command failed: transaction build  Error:
 The era of the node and the tx do not match.
  The node is running in the Babbage era, but the transaction is for the Alonzo era.
  \n"}

How can I create babbage era tx. Whats the difference from Alonzo Era?

user4627: You can probably just add --babbage-era to your cardano-cli transaction build (or build-raw) command. You'll see this option when you enter cardano-cli transaction build -h.
As per this issue and this comment the alonzo-era is still set as the default for now.
Regarding the differences, the babbage era brings lots of new features and possibilities, that you can find a good technical overview of here, including: reference inputs, reference scripts, inline datums and much more.

4880: <p>I can't use my old Tx creator (cardano-cli) from Alonzo era.</p>
<pre><code>Command failed: transaction build  Error:
 The era of the node and the tx do not match.
  The node is running in the Babbage era, but the transaction is for the Alonzo era.
  \n&quot;}
</code></pre>
<p>How can I create babbage era tx. Whats the difference from Alonzo Era?</p>
 4627: <p>You can probably just add <strong>--babbage-era</strong> to your <strong>cardano-cli transaction build</strong> <em>(or build-raw)</em> command. You'll see this option when you enter <strong>cardano-cli transaction build -h</strong>.</p>
<p>As per <a href="https://github.com/input-output-hk/cardano-node/issues/3900" rel="nofollow noreferrer">this issue</a> and <a href="https://github.com/input-output-hk/cardano-node/issues/3900#issuecomment-1150514216" rel="nofollow noreferrer">this comment</a> the alonzo-era is still set as the default for now.</p>
<p>Regarding the differences, the babbage era brings lots of new features and possibilities, that you can find a good technical <a href="https://github.com/input-output-hk/cardano-node/releases/tag/1.35.0" rel="nofollow noreferrer">overview of here</a>, including: reference inputs, reference scripts, inline datums and much more.</p>
