Unfortunately, it looks like Aave has frozen their CRV market, meaning that it is no longer possible to borrow CRV from them. This is likely due to the current market conditions, as Aave is trying to protect their users from any potential losses that may occur. It is always important to be aware of the risks associated with any type of cryptocurrency trading, and Aave is doing its best to ensure that its users are safe. Hopefully, the market will stabilize soon and Aave will be able to open up their CRV market once again.