Custom Button URL using an IF condition

I am trying to create a custom URL button in salesforce and when hitting save getting the below error:

Error: Enter a URL that is valid and well-formed

This is the formula I am using:

{
!IF( 
AND(
Project__c.RecordType  = 'Minor Works Project',
{!NOT(!ISPICKVAL(Project__c.Type__c, 'Training'))})
,
URLFOR("https://datacom--uat.lightning.force.com/lightning/r/Report/00Op0000000cBzHEAU/view?", null, 
    [fv1=Project__c.Client_Contact__c]),
 {!IF( 
AND (
Project__c.RecordType  = 'Minor Works Project',!ISPICKVAL(Project__c.Type__c, 'Training')
),
URLFOR("https://datacom--uat.lightning.force.com/lightning/r/Report/00Op0000000cBzHEAU/view?", null, 
    [fv1=Project__c.Client_Contact__c]), 
URLFOR("https://datacom--uat.lightning.force.com/lightning/r/Report/00Op0000000cBzHEAU/view?", null, 
    [fv1=Project__c.Client_Contact__c]))}
)
}

PS: I just copied the URLFOR statement from a previous Help article. I am not sure why and if there is a need for the Null in the URL I used

Any help is deeply appreciated.