Because web3dart >=2.5.2 depends on http ^0.13.5 and every version of ttb_core from path depends on http 1.1.0, web3dart >=2.5.2 is incompatible with ttb_core from path.
So, because ttb_wallet depends on both ttb_core from path and web3dart 2.6.1, version solving failed.
Because web3dart >=2.5.2 depends on http ^0.13.5 and every version of ttb_core from path depends on http 1.1.0, web3dart >=2.5.2 is incompatible with ttb_core from path. So, because ttb_wallet depends on both ttb_core from path and web3dart 2.6.1, version solving failed.
Thank you.