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Force.com IDE 2. Salesforce DX

We are trying to install "Force.com IDE 2. The Eclipse IDE plug-in for Salesforce DX" and we follow all the steps include in the guide:
https://developer.salesforce.com/docs/atlas.en-us.sfdx_setup.meta/sfdx_setup/sfdx_setup_intro.htm

But when I try to 'Pull the Source' an error ocurred:
    Operation Failed

    MemberName, IsNameObsolete FROM SourceMember WHERE RevisionNum >
                                ^
    ERROR at Row:1:Column:52
    sObject type 'SourceMember' is not supported. If you are attempting to use a custom object, be sure to append the '__c' after the entity name. Please reference your WSDL or the describe call for the appropriate names.


And there is no way to continue.
Daniel BallingerDaniel Ballinger
I suspect that the Salesforce DX source push and pull calls only work against scratch orgs. The Sandboxes currently don't have the required Tooling API SourceMember.

Instead you will need to pull the sandbox metadata down and convert it to the sfdx format.

See SalesforceDX CLI “sObject type 'SourceMember' is not supported” with source pull (https://salesforce.stackexchange.com/q/191719/102)