What's wrong with this code

/summon Mooshroom ~ ~ ~ {ActiveEffects:[{id:14,Duration:100000,Amplifier:1,HideParticles:1}],Riding:{id:"Spider",Attributes:[{Name:"generic.maxHealth",Base:10000}],Riding:{id:"Villager,Attributes:[{Name:"generic.maxHealth",Base:10000}],Riding:{id:"Spider",Attributes:[{Name:"generic.maxHealth",Base:10000}],Riding:{id:"Bat",Attributes:[{Name:"generic.maxHealth",Base:10000}]}}}}}

In the command block console it says:

data tag parsing failed: Unbalanced quotation:{ActiveEffects:[{id:14,Duration:100000,Amplifier:1,HideParticles:1}],Riding:{id:"Spider",Attributes:[{Name:"generic.maxHealth",Base:10000}],Riding:{id:"Villager,Attributes:[{Name:"generic.maxHealth",Base:10000}],Riding:{id:"Spider",Attributes:[{Name:"generic.maxHealth",Base:10000}],Riding:{id:"Bat",Attributes:[{Name:"generic.maxHealth",Base:10000}]}}}}}

What's wrong?

A couple of things. First of all, a mooshroom is called a MushroomCow in the code. Second of all, you missed a quotation mark after 'Villager'.

/summon MushroomCow ~ ~ ~ {ActiveEffects:[{id:14,Duration:100000,Amplifier:1,HideParticles:1}],Riding:{id:"Spider",Attributes:[{Name:"generic.maxHealth",Base:10000}],Riding:{id:"Villager",Attributes:[{Name:"generic.maxHealth",Base:10000}],Riding:{id:"Spider",Attributes:[{Name:"generic.maxHealth",Base:10000}],Riding:{id:"Bat",Attributes:[{Name:"generic.maxHealth",Base:10000}]}}}}}